PC3500 2x256mb Dual channel

Been looking at a few of the 'other' memory sellers out there and was wanting some opinions on them:
http://www.ocsystem.com/ocx251pcddma1.html $99.00

http://www.enetshoponline.com/duchddpc511.html $128.00

http://store.yahoo.com/digi4me/me516ddrpcd4.html $77.00

Or should I stick with the norm: GEIL, Mushkin, Kingston, etc...

GEIL 512MB(2x256MB) PC-3500 (433MHz) Dual DDR RAM, 6 Layer Lower Noise PCB Copper Heat Spreader, Dual Channel SPD Enhanced Model# GL5123500DC
Specifications:
Dual Channel SPD Enhanced PC3500 Dual DDR 512MB. Special design for dual channel motherboard
Type: 184-pin DDR Memory
Capacity: 512MB
Speed: PC-3500(433MHz)
Voltage:2.6-2.9
CAS 2 6-3-3 1T for $125.00

`syas nothing about what chips are sitting on those sticks... at the very very least i'd call.

those translucent green pcb's do look pretty cool though.