Keyboard and mouse will change but won't be of the gaming variety.Waiting(and tired of it)for the non reference r9 290's to release later this month or at my luck next year.
My problem is the monitor.I don't really want a 120 hz monitor,it is really expensive.I thought i would get one for cheap(220) during the sales but that never happened.I would really love one but not for more than 200 bucks,which is crazy.
I want to get a cheap 1080p 60hz monitor(100 bucks) but have noticed a few comments saying how noticeable tearing and other problems will be. I'm buying the card for longevity not to push out 100 plus fps every game;but to maintain 60 fps over the next few years. Will i be ok for the most part with 60hz? Maybe 75 if i can find one.
23.6", 1080p, HDMI port, 2ms response time, 75hz
Typically runs around $130 (or you may find the VS248H-P cheaper which is basically the same monitor but sometimes dips below the 247H-P).
I use that with my Sapphire HD 7950 boost OC and I love it.
Only cons is that the monitor stand is a bit flimsy, and the display comes yellowish out of the box but you can easily adjust the appearance options.
For me at least 60hz monitors have been just fine. I run 3 Asus 27" 60hz monitors on all three of my rigs and they work great. I do not need 120fps when 60 works just great. Get one with good response time and you should be just fine.