There is also the Orion Shorty Plus.
Mind you I don't have a scope atm, but if I did go the 10inch dob, that could be worth considering.
BTW: I was in the same dilemma with the barlow sizes. Strange though, the 2.5 T/V powermate is less expensive than the 2 x TV powermate, maybe cause its only 1.25 inch only.
$450 - ouch - but it could cover all your bases and you wouldn't be in the pridicament down the track, I should have bought.....
norm