Curtis - let me help you open your wallet a bit more. . I had the MX-500 for about a year (IRclone and I didn't get along very well, but I'm sure that was due more to operator error) and upgraded to the MX-700. As good as the 500 is, the 700 is much better. Kinda of like going from a mini-van to a Corvette. Spend the bucks - you will not regret it for a minute. Plus, you'll have a very nice spare MX-500 for your second setup in the den.

On a more serious note, the new MX-850 Orion has just been introduced and it replaces the MX-700 / MX-800. The supply of 700s should start to dry up shortly.