Just my opinion of course, but I'd get a Rena Filstar XP3 aka XPL. It supposedly has enough filtration for 175 gallons, it's quiet and easy to use & clean. I have one of these on my 36 gallon bowfront and it's been awesome. I bought that filter used on craigslist for $60 but they only cost about $125 or so on Amazon, in fact I did a quick search and Big Al's online has them for $104 plus $10 shipping.
I liked my XP3 so much that I bought a XP2 brand new & I paid less than $75 via Amazon with no tax & free shipping! I think it was only $60.............
The older ones are marked XP1, XP2, XP3 & XP4 and the newer ones are called XPS, XPM, XPL & XPXL with the only real difference being that the new ones don't come with all the accessories such as spray bar, flow control valve, etc.