Hi Jappy,
I concur with all those here who suggest you opt for the EP350 over the EP175. The 350 really delivers a great deal more deep bass extension and output.
Here's an option you may not have considered to keep you within budget: In a room the size of yours, think about substituting a pair of the M22s instead of the M60s. The M22s used with the EP350 sub will play remarkably loud--not as loud as the M60s--but as loud as I ever want, and my room is 19 x 13 x 9.5 ft. I sit between about 9 ft and 15 ft from the front speakers.
Regards,