Ah sorry, misunderstood that bit.
Well Xecuter 3 is the new latest chip everybody and their mother wants, and it's got so many new featues... and really is a stunning chip.
However, it's worth bearing in mind that the 2.6 will run all the software, games, apps etc that the 3.0 can. The 3.0 isn't 'more compatible' or anything, it's just got a whole host of new features and customisables.
Even pre-2.3 chips will run any piece of software you throw at it.
So that leaves the decision down to you. With the recent release of the Xecuter 3.0, the Xecuter 2.6's have dropped in price quite rapidly, and you can get some real bargins on the things now. I bought one the other week for a mere 20 GBP, with an extra 10 GBP for the Xaptor.
If you think you'll use the extra featues offered in the 3.0's such as the Live Config setup or LCD screen support, go for that. But if you just wanna run your games, and apps and dashboard and the works like that, save yourself a bit of cash and go for the 2.6. You canm still disable the chip for Live. If you've never soldered before, get one packaged with a Xaptor.
Least that's my view on the situation.