im going to build a mainstream rig(for my aunt) mainly just using single threaded applications(msoffice) including a little bit of games, im looking @ arctech's website currently A64 3500+ costs Php 6000(hopefully it will still lower down) and A64 X2 3800+ which costs Php 9700, since im really on a tight budget (php45000

including monitor,printer,computer table & accessories waaaaa!).
i understand im comparing cpus which is not on the same playing field but what im after is to fit into the budget since the x3800 is the most affordable dual core i can get & i might just be wasting it's capability if it can't be fully utilized later on but im also concerned it's capability within the next 6-18 months in case most applications might maximize using dual cores already....
im planning to just invest more on gpu,ram & a good psu...
if u were in my situation will u build a single core or dual core cpu?
thanks...