That's not bad, Heady! You drive a hard bargain! That Pet Place has them listed at about $75!
Back to the topic of the thread...
SBee, my normal proclivity is to overfilter. I have an overstocked 75 that has an Emperor 400, a prefiltered Eheim 2028 (with dummy canister filled with ceramic noodles on the outlet), and a prefiltered HOT Magnum with biowheel. That tank has a lot more than a dozen fish, though...
I wouldn't run any larger tank with only a single filter. If that filter cashes out, you're in trouble. (That always happens when you're on vacation, too!) Small mbuna become large mbuna pretty quickly, and even when small, they're much messier than most other fish.
In a tank like the one you describe, I'd want to separate mechanical and biological filtration. I'd get a canister (I like Eheims) and load it with some non-clogging, permanent media like bioballs or, even better, ceramic noodles like Ehfimech. I'd prefilter it with a sponge to help keep crud out of the can. I'd the get an easy-to-clean mechanical filter. I prefer HOT Magnums with a sponge prefilter; internal canisters, esp. Eheims, are nice, too. (RTR has a very good article on this at http://www.tomgriffin.com/aquamag/cannister.html.)
Cichlids are much messier than most other fish, so the slight extra expense of a second, mech-only filter is truly worth it.
You can go nuts and get more filters (it works for me!), but two should be enough for a dozen mbuna in a 75.
HTH,
Jim
I sure found it surprising though that there was a 60 dollar difference in price between the two stores. That's just insane. 
