I just got a dual 867 MDD powermac very cheap and i'm very happy about it.  I also have a Mac mini G4 1.25Ghz.

One of them must go and I would like some input on which one would be better to keep. 

The mini has a slightly faster bus but the MDD has dual cpu and L3 cache.  I know the MDD is more expandable but I want feedback on which system will be better looking forward.  I will sell the other.

Please share any thoughts.

Thanks in advance.
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Mac mini C2D 1.83GHz - 2GB RAM - 200GB 7200rpm HD
Sawtooth w/G4 1GHz - 1GB RAM - SIIG SATA w/2x1TB HD
B&W w/G4 600MHz - 1GB RAM - 2x80GB HD
Sawtooth G4 400MHz - 512MB RAM - 40GB HD
Dell Ultrasharp 2007WFP 20" Widescreen LCD
2.94TB Total Storage