hmmm....i think you should just save your money for the long run because your system is still pretty good. maybe you might wanna purchase a bit more ram for your encoding and video editing task and your good to go.
hey pigwalk, ive ordered from directron before and they had a pretty good customer service. i ordered a case and i received it in time. i only ordered from them once though but i recommend them because i never had a hassle with them.
check out www.newegg.com www.pricegrabber.com www.zipzoomfly.com and www.mwave.com and see if you can find the right model of corsair memory on these sites. good luck
definitely check you heatsink. i remember when the temps of my athlon xp were high too and to cut it to the chase, it turned out that my thermalrigth SLK-800 had a big chunk of dust between the HsF and the fan. check your hsf and see if there is dust build-up around it.