You might want to E-mail Corsair and ask them if their PC150CL2 is rated 222 or 233. If it's rated 222 then it means its the very same stuff as the Mushkin Rev3. I wouldn't bother with the Mushkin Rev2, its PC133 SDRAM and you want 150mhz guaranteed. Also dont get 2 sticks of 128mb because multiple sticks can reduce performance.
Either go with:
256 mb Corsair PC-150CL2 (after checking its 222 and not 233)
or
256 mb Muskin High Perf. Rev3
Both come from extremely reputable companies with great support and a lifetime warranty. If needed a PC150CL2 stick for my comp, Id pick one of those two.
PS: about the Corsair RAM, they used to have the 222 or 233 in their spec sheet but it mysteriously disapeared

I liked their old spec sheet better where they said "This stick was tested on this mobo and that mobo" and everything.