I've been searching for a list of available hardware I could choose from when building a quadrotor (or hexa / octo / ...). Has anyone passed around a list like that? I'm interested in complete hardware solutions only (software is irrelevant). I'm also only interested in low-cost, so no professional army stuff please (preferably < 500$).

For start, I'll list the solutions I know of:

1. ArduPilot Mega 1.0 + IMU, price around 250$
2. ArduPilot Mega 2.0 (purple), 200$
3. MultiPilot32 + IMU, 130Eur, around 170$
4. Paparazzi Booz, I don't know the current price nor where it can be obtained at the moment
5. ROFL, 155GBP, so around 250$ for an ARM board + IMU (called Forebrain + Seraphim here)
6. Bill Nesbitt's AutoQuad, I don't know whether is or will be available for sale
7. UAVP NG, around 1000$
8. OpenPilot CopterControl, 130$ in Europe

Of course the above platforms all differ from each other in many ways. It would be great to built a sensible comparison matrix in the future. Please let me know if you know any more cheap hobby quadrotor hardware or have any other ideas on how to compare them. Also please let me know if you discover any errors.

Regards.