DUDE remember, not sure if u no or not, when buying dual channel make sure to buy dual channel kits, not buy 1 type of stick here and another there, dual channels come in sets. just a heads up.
DC will not be a big boost. If you buy excellent ram with loose timings and OC the dooggie doodoo out them......you will notice a definite performance boost......otherwise, value Ram 2x1gig is your best bet in DC, even though you will not see much of a change in system performance.
Most of the time, when working with total memory amounts of 2Gb or less, less sticks = higher performance, especially with dual-channel. Just be sure to buy competitive timings too.