@Rawhide15: depends on what you want to compare.
intel build @ $600 (adjust for hdd price)
http://www.tomshardware.com/reviews/core-i5-overclock-performance-gaming,3097.html
http://www.tomshardware.com/reviews/diy-gaming-pc,2970.html
amd build @500~
http://www.tomshardware.com/reviews/budget-gaming-pc-phenom-ii-radeon-hd-6850,2903.html
http://www.tomshardware.com/reviews/phenom-ii-overclock-graphics-card,3032.html
you can move some components around at different price points to build a system within your set budget.
in terms of cpu performance, intel outperforms amd by a good margin right now. they also bottleneck gfx cards less at cpu bound games and lower resolutions. they provide more minimum fps which results in smoother gameplay.
amd's current cpus are only good for using with their new 9xx series chipsets. those are one of the good stuff amd has going for them right now. 990x and 990fx offer cfx/sli on prices lower than intel's. 990fx natively supports x16/x16 cfx/sli. intel's sandy bridge only offers x8/x8 cfx/sli with p67 (b3) or z68 and x16/x16 with x79 (very costly) motherboards. but amd's current cpus bottleneck gfx cards more than intel cpus.
amd's apu's are great for entry level pcs that don't want to rely on discreet gfx cards. they offer discreet class igp with a decent cpu. recently, amd released overclockable versions of their apus which can offer even more cpu+gpu performance.
intel's igp has only one good point - quick sync. they're good for very basic tasks - web surfing, basic word processing etc.
amd's gfx cards hold the current performance crown with the new gcn-based radeon hd 7970 3gb. their gfx cards offer good performance at lower price. they also have cards like radeon hd 6670 - the most powerful gfx card that doesn't require extra pcie power connector, radeon hd 6850 - the most powerful gfx card that requires only one pcie pwoer connector. amd's gfx cards are usually plagued by amd's terrible driver support. amd has come a long way in terms of drivers, but they still screw up big time when demanding games launch.