[Cube] Upgrade paths?

[Marc Stergionis]

I've been off for awhile. I have a stock 450mhz Cube with 1.5 gb ram 
and Apple Studio Display (ADC).

Since a new computer is not  a popular idea around here (although I 
do have a G4/FW800 Powerbook too), I'm thinking of upgrading the 
cube. In a short search I only see Sonnett and Powerlogix cpu cards 
available.

In a nutshell, is one much better than the other? And what glitches 
do they have? Currently running 10.4.10 and would be nice to run 
Leopard, but not imperative. ... I know that will be an unknown for a 
few days anyway :)
-- 
Marc Stergionis