+1 on the recommendations for the GTX 750Ti  pretty cheap and I can get 200+ fps with everything maxed out.  Spending more for a MC box isn't useful.  I actually limit my fps to 60 to save on power (plus why would I need 200 fps?).  +1,000 on a SSD.  I went for a little 128GB Samsung 840 Evo and it loads everything so fast compared to spinning drives; I never tire of it.  It loads Lubuntu 14.04 from a cold boot in 10 seconds.  Makes my work laptop booting Win7 seem like a sloth.