My 'repoweresque' modpack:
chainz (chainmail. and elevators!)
Minefactory reloaded (redstone logic, programming, etc) (block breaker, numerous other items, item transportation)
Extra utilities (tubes, more logic, liquid/bc power movement)
better furnaces mod (improved/faster furnaces, lowered fuel use, ore multiplication)
Advanced dispensers mod (deployer)
magical crops (just good all around extra vegetation spawn, better thread farms in combination with MFR)
immibis microblocks and anchor (because CJ's anchor sucks)
barrels 1.5+ (bulk storage)
Dr. Zhark's (because it's fun)
Utility Mobs (for defense)
redstone in motion (big devices)
Railcraft (Because I happen to love enormous, complicated train layouts... however, I use 'minecraft style' recipes. the hard recipes belong on challenge servers)
modular Power suit (something to blow all those enormous resources on)
MPS addons (more stuff to blow resources on, plus recharge)
Minecraft Minions (buggy, but fun to slap around)
minecraft comes alive (interaction)
Millenaires (interaction, quests)
NEI (of course)
Omnitools
Pam's clay spawn (because you can never have enough clay when playing with railcraft)
treecapitator (because trees dangling in midair look retarded)
Essentially, it's a very fun way to play. You have all the tools you need, an end goal, really challenging enemies, base defense, stuff to blow resources on and feel like you are accomplishing something. (an army of soul golems in powersuits is really something to see!) decorative elements, full automation for all entities and animals, some of the most user-friendly farms in the modded game, NPC's to interact with, research (horse breeding), Mineral management and multiplication, advanced logic (in case you wanna make something weird), and constant attacks by deadly animals.
there are almost no interaction difficulties, all power requirements are buildcraft (without buildcraft's overhead), and virtually every single mod is specifically designed to have as low a cpu/memory impact as possible.
This runs just fine on my crappy 4 gig machine.
There is only one additional ore, which is used to craft magical crops exclusively. You do not have to disable 12 different types of copper, 14 kinds of bronze, a dozen tins, a few silvers, and a host of other one-shot ores. and you especially don't have to wrestle constantly with the ore dictionary. It has omnitools for turning chests and ignoring any wonky tools. I HATE a huge list of various tools you need to monkey with for each mod, and want a cohesive, integrated play experience.
there is a 'food sink' (minions) and endgame, exploration means and reasons (millenaires, MCA, Powersuit flight), and your automation tends to look a LOT more like automation than a macdonald's playplace or habitrail gerbil maze.
railcraft, MFR, and extrautils automation:
buildcraft and redpower automation:
In all, I think that I have weaned myself pretty effectively from the 'standards' of IC2 and redpower, and have ditched all but buildcraft's power and liquid API (Not looking forward to trying to find previously BC-compatible mods that work with CJ's new CF) I won't touch AE (the whole mod feels like a complete and total cheat, and it adds new ores and stuff) and Forestry just feels....Like I am playing something other than minecraft.
I have 'internal rules' that I follow (no blocks in pipes or barrels, gotta use conveyors and traditional storage for big stuff like blocks, treetrunks, planks, etc.) (No minion mining... minions are there for clearing out spaces or landscaping only) (No floating stuff... blocks have to be framed and reinforced to actually resist gravity) in order to keep the thing challenging and at least nod to physics, and on the whole I am having a blast.
I heartily recommend that people try building 'their own personal ssp modpack' at least once to try it out, and play the game YOU want to play... one of my long-standing grudges with redpower (and better than wolves too!) was that there were no config options to disable stuff like volcano and marble spawns... you were forced to play the game 'they' want you to play instead of the game YOU want to play. Contend with THEIR notions of balance instead of your own.
On the whole, I consider redpower's TEMPORARY absence to be a shot in the arm for the modding community. I look forward to seeing it come back, eventually, but hopefully in the future players will have more options and alternatives... so they can play the way they want to. So go ahead, find a good forge build, and make your own personal SSP modpack... no permission slips needed.