Yes, but only because the A64s are the best performing, and coolest running chips. It is nice that you will get a future bump when you switch to a 64 bit os, but right now, it doesn't matter. The A64s are just a better deal.
"64-bit" PC processors are actually 32-bit cores with 64-bit extensions. As such nearly all the performance numbers you see are for 32-bit applications. AMD's Athlon 64's offer more performance in most 32-bit applications than P4's.
<font color=blue>Only a place as big as the internet could be home to a hero as big as Crashman!</font color=blue>
<font color=red>Only a place as big as the internet could be home to an ego as large as Crashman's!</font color=red>
The others mentionned it! 64bit support is a bonus that will give you a free upgrade to 64bit when you will be ready!
The real question is WHAT will you do with your PC? This will help you choose the right CPU you need! The apps. you will run on the PC will guide you in your buying decision and 32bit or 64bit will only be a "+" if you hesitate between 2 CPU or platform.
A7N8X / <font color=green><b>Sempron 2800+</b></font color=green> <- <i>Is this affecting my credibility?</i>
Kingston DDR333 2x256Megs
<font color=red>Radeon 8500 128Megs</font color=red> @ C:275/M:290 <- <i>It's enough for WoW!</i>