Hum,
Well I suppose it depend on what you want to do, where you live (ie how changeable the weather conditions), and price.
A 2” is ok for a general scan of the skys.
But at least a 3” (with a short tube length) is really recommended.
I made a page with a few recommended
scopes/prices.
(ie SKYWATCHER MERCURY-705 (£129) is what i would want santa to bring)
So what are you interested in?
Deep sky, double stars, variables, planets, comets or just sight-seeing?
I suppose living in Texas, with clear skies (a 4" refractor would be too expensive) but a big scope like an 8-10” (dobsonian) reflector would be nice. (A real hassle living in cloudy Britain though)