well, i don't know your budget and what stores are in your area, and i don't know if you want to swap CPUs in the future, but if you do want to swap CPUs in the future, socket 754 is going to die real soon (look at AMD's roadmaps). socket 939 isn't much more expensive (check anandtech RTPE
http://labs.anandtech.com/) along with other online stores, if you plan to buy online, otherwise you can just use RTPE to get an idea of how much stores online are selling CPUs and other parts for so you know if you're paying a good price or not)... also athlon 3000+ is relatively old. there are two versions, based on the hammer core (i believe that's the original? can someone verify that) and a slightly later version based on the newcastle core. replying to your previous post, to add SSE2 support to an Athlon XP or derivative (sempron socket A) would be EXTREMELY costly. AMD could not turn a profit on those chips because it costs lots of R&D $, so to make a profit would mean they would have to pass on the cost of R&D onto the consumer (that's you), which would probably mean it would be cheaper (and higher performance too!) to get a socket 754, 939, or 940 solution, if you're going AMD that is.