For once I agree with Wavytone
( and its not F15 ! ) .The Skywatcher 190mm ( 7.8" ) F5.3 ( ?) Mak- Newtonian is one of the unsung gems in the imaging scene. Flat field , essentially no coma , and no diffraction spikes.
At $1500 at Andrews an absolute bargain . They are rebadged under a number of other brands too. Got a great write up a while back in Skya and Telescope review. Apparently an HEQ6 was straining with it so you won't get away with an Heq5 though ( Edit : just saw you have an EQ5 - well you could give it a try !)