What applications do you plan on running? I use Visual Studio and Office 2007 in my virtual machine. They're both very responsive. I suggest getting as much RAM as possible as well.
If you have atleast 2 Gigs of ram, and a Dual-Core processor Parallels will suit all your non-3D needs. Its actually pretty fast. When I first used it I was expecting something comparable to VirtualPC.. HAHAHA, thank god its not even close.
Hi, I am assming that office 2007 and the bible programs i mentioned are not 3d programs.
Consider Fusion as well. I started with Parallels but switched to Fusion once Leopard was on my system and Parallels didn't want to cooperate.
Yes, some benchmarks show that Parallels is slightly faster, but I find Fusion boots up from a paused state a lot faster. I also find it a lot more user friendly.