2 x 10 with 15

will a rb400 Gk head be enough for that, pushing about 150 at 8 ohms? What I may do is get a 2 x10, or 4 x10 and build a 15 sub on my own to save cash, but concerned about my head being to weak. Also I have been reading about running 10's or 12's with a 15 or 18 sub. Basically what im getting from that is the 15 just muddies it up when you do that, the 10's cut throught very good when you play live but I know they can't really get as low as the 15. Also I know the manufacturer of the cab and speaker type has a lot to do with it as well.