Thanks Rick,
I have had the opportunity to test all of these planes very extensively. The Dalton 260 is the former TBM 260 with a few mods that make it much sturdier for everyday flying. The plane is coming in around 37-38 lbs with canisters. The plane is a very easy build from the kit.
The 300 and 300L are from Robert Godfrey Precision Aviation Design. This plane was originally a 300L but eventually made into the mid wing 300 due to a more axial rolling tendency.
Both aircraft are teriffic for sequence flying and Freestyle. I think that they are both capable of doing certain things better than the other, but in the end it comes down to looks, time, and money.
I flew thw Mid Wing 300 at the last two NATS and MASTERS.
I flew the TBM at the JR Challenge in 2003 with success

Sorry...this is probably not much help.

Mark