With that scope, the cost is divided between the tripod, the mount, and the scope. With a dobosonian, nearly all the cost is on the scope and a couple of bucks for the bits of mdf that make up the base. The mount and tripod on that Mak aren't going to be of a particularly high standard (next to useless IME). That whole cost going towards the scope will get you much better aperture too.
That said, the dobs aren't for everybody. That Mak setup is pretty portable, most dobs aren't.
If those are the sort of dollars you wan't to spend, I'd recommend the 130mm dob
http://www.ozscopes.com.au/skywatche...telescope.html