AMD 64x2 OR Pentium d

Ive heard that amd runs games better than pentium.Then someone on this site helping me make a pc choice said,go for penyium daul core i.e pentium d.Would anybody with this experience comment on this.
Also what packages are there for around £650 £700.
Im also stuck on what graphics card.The 7900 and the 7600 is just out of my price range.Any suggetsions on cards that will run todays games like company of heroes,flight sim 2004 and fsx.
The most important point is the proccessor chip.AMD or PENTIUM.
Any suggestions would be great as im going out to have a look in pc world today.Thankyou

Check out this thread.

http://flyawaysimulation.com/postt17433.html