Choose by price only.
The 3200+ system is dated so make the choice by price only.
And I didn't write about the 2.0GB App memory limit or XP's reporting of 2.1 to 3.5GB RAM. That's been well discussed.
Should I go w/ 4 1gb sticks or 2 2gb sticks. Running XP home 32bit/ AMD 64 processor 3200+ 2.GHZ