[Trippynet]

I've never owned one, but I'd say the Octane. O2 has some advantages (VGA out, built-in CD), but the plastics are unbelievably fragile, plus it does feel slow at many things. Octane is noisy, but relatively reliable and quite powerful. You can also get decent 3D capabilities that aren't too expensive.

I'd avoid Indy because despite being a nice little machine, it is relatively underpowered. Another alternative would be an R10k Indigo2. Solidly built and much quicker than and Indy and many O2s, but the downside is that decent 3D options for them are in short supply and are pricey these days.