Christ, had in the back of my head that i'd be able to upgrade the ram on my new imac for a perfectly reasonable price (based on the fact that i wacked 4GB into my 2.2GHz MacBook for about 50 quid) but it turns out to go up to 8GB is around 600 quid 
just wondering, is there a decent alternative to this ram, maybe by picking a lower spec DDR2 ram if its even possible?

just wondering, is there a decent alternative to this ram, maybe by picking a lower spec DDR2 ram if its even possible?