I'm not sure I'd trust OCZ. From their past, I'd be really cautious about buying them. Anything of the Epox brand in the past couple of years I personally wouldn't touch.
I haven't tried it, but Geil DDR seems to be pretty good and pretty cheap. I've also been reading rave reviews over PMI's DDR.
For the motherboard, I'm running the Asus A7N8X-E Deluxe myself and I'm very pleased with it. Other popular choices are Abit's NF7-S ver. 2.0 and the DFI LanParty/Infinity boards.
For heatsinks, you might wanna look into ThermalRight stuff like the SLK-800/900 series. I'm not saying the other coolers you linked are bad, but I'm not sure how well they'll perform.