I find AMD to be more reliable, I used to work in a computer service shop, and we'd always recommend AMD over Intel. All the computers I have ever had/built had AMD processors. ATM I'm running on the AMD Athlon II x4 620.
Intel is far better right now (both in performance/price) because of the newly released Sandy Bridge, but you won't be able to get a Sandy Bridge processor anyway because there was a problem with the 3Gbps SATA ports on the motherboards (they were all recalled). There won't be replacements until around March/April.
My advice is that you wait until Bulldozer for AMD is released. It should only be half a year away. Then you can compare that to a Sandy Bridge processor in the same price range and make your decision.
That is exactly what I am doing, can't wait to build my new PC.
Toms is a great site for comparing components. You can also find their monthly value reviews for video cards. Wait as long as you can until making your computer - the performance is always rising with prices always falling, its just a matter of how long you can hold out.