[sid645]

These are the roms I have tested thoroughly with my HTC Diamond for Alltel

Conflippers (obviously)
Calkulin's Diamond 21028 ROM (4.5) (even works with custom manila cabs!)
Juicy ROM 4.6 (love the custom icons and new menu effects)
TerSoth's ROM 1.0 (a little buggy)
MightyROM 4.7 (Fast and smooth!)
FuFu's ROM 4.2 w/ Windows 6.5 (WIP...has its issues with performance but is a very good windows 6.5 ROM)
FuFu's ROM 4.4
OMJ's 2.00 Custom ROM (LOADED with apps and I like the custom taskbar)
intxROM v1.1 Rhodium (Works very good!)
GrooveROM4 (works!)

I am currently using MightyROM 4.7 in combination with Calcu's manila theme (Landscape Sprint 1.2)