abit ic7 and cpu upgrade what to go for lost

[systemsdead]

any suggestions on what i should replace with all will be going in a antec sonata black case,i built this a few years ago and not up on all the new stuff available at the minute,also would i need to replace the radeon 9800 pro,not really into gaming on pc anymore but would like to stream mkv 720p files without stutter to 360-ps3 also the odd encoding,budget is pretty low £200 max not fussed which type of cpu amd or intel.

 

[systemsdead]

thanks for that tetras i will look into it,you mentioned micro atx would that fit in antec sonata case i think last mb was atx

also is my radeon 9800 not worth keeping whats the cheapest card that will perform better than that,thx again