The below memory modules are available to me at a very reasonable price.

I'm unsure as to what type of memory is compatible (FB/Registered).

Code:
Vendor	Manufacturer	Description			Type
Sun	Micron		2x1GB 2Rx8 PC2-5300F-555-11-A1	Fully Buffered
Sun	Samsung		2x1GB 2Rx8 PC2-5300G-555-11-A0	Fully Buffered
IBM	Samsung		2x1GB 1Rx4 PC2-5300P-555-12-H3	ECC Registered
I can't decider whether to:

Buy 8 sticks for 1 motherboard.
Buy 16 sticks for 1 motherboard.
Buy 16 sticks for 2 motherboards.

If I think about it, I don't really need 2, but this is XS after all, and I'm conscious that this may be the only chance I ever have to buy the boards without having to re-mortgage my house.

Thank you all in advance.