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Check the FTB Pack Comparison link in my signature. Mystcraft is probably one of the more minor mods you don't have; it lets you create more dimensions to your specifications.
Umm... you would have to close your client, open the FTB Launcher, launch vanilla. Right now: close your client, open Minecraft Launcher (in same folder??), launch vanilla. What is the problem here?
Although I don't play with it much anymore, Flan's Planes Mod was the first thing that really got me into mods. After that, I discovered IC2, BC and EE2, and didn't look back.
You might want to move Optifine and ShadersMod down to Extra Mods, because they aren't part of any FTB pack. Also OpenCCSensors and Ars Magica are pretty much confirmed for 1.5 too.
EDIT: Iskander: if something generates something in the world, I would count it as world gen.
If you mean Ultimate 1.0.2 (last 1.4.7 release), it is currently in the launcher, but not recommended. If you select Ultimate, then just under the Maps tab there is a menu to select between 'Recommended', '1.0.1' and 1.0.2'