Maks have less obstruction, therefore better contrast that that of a newtonian. They also have much larger focal length. You cant really make the same comparisions as you can between newts.
Power can make up the differance as well, light gathering power is related to more than just apperture.
You can get 1900mm 6inch Mak with 2" focuser from andrews for $399 brand new.
www.andrewscom.com.au