Hi, long time lurker, first time poster. I was trying to decide between the TRX420FM and TRX500FM for the last few months as well. Both quads have their pros and cons. I personally decided on the Foreman because I will be doing some deer lease work with it as well as moving my boat around the house, the hp ratings are close but the foreman has the low end grunt to get a load moving. I decided I'd rather have it and not need it, than need it and not have it! Also, the price difference was only $300 out the door. Those are the reasons I chose a Foreman, that doesn't mean I think I'm right and everyone should buy what I did. They're both great bikes, good luck to you. I bought mine 12/14/07 and am really enjoying it!