If your looking for good bang for your buck:

http://www.penguincomputing.com/

We just ordered a Dual CPU AMD Opteron system from them for about 1/2 
the cost than an equivalent machine would cost from HP, Dell* or IBM

*Dell doesn't sell Opterons - just the inferior Intel EMT line (due to 
intels stranglehold on Dell)

And Dell and HP are still about 1/2 the price of Sun...

Dan


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Daniel Armbrust
Biomedical Informatics
Mayo Clinic Rochester
daniel.armbrust(at)mayo.edu
http://informatics.mayo.edu/