Frontosa Envy

Anyone care to offer an opinion on stocking a 75gal for an initial setup.
After making an initial mistake by stocking ten mixed mbuna from Pet
Supplies ( I know I've got two to three auratus that everyone tells me to
get out of there) I've now decided that I would like a Frontosa. Do you
think this tank is big enough? Also if I go that route, what other smaller
fish would go with it. This setup is to go in my office and essentially I'm
looking for a setup that will not be hard to maintain, will provide a lot of
interest for myself and one that will draw attention from others.

The seup is as follows:
(1) cichlid mix sand as substrate
(2) 80lbs of lava rock
(3) one Fluval 404 filter
(4) ten mixed mbuna (I know that normally these don't go with Frontosa -
what to do?)
(5) from my old tank - two angels, four neons, one pleco (they'll have to go
I'm sure but for the time being seem to be okay in the high pH)

Also, what should I be looking to pay for a Frontosa that's small and who's
a good source. I'm not necessarily looking for a high quality breeder. What
is the minimum number that I can stock. Is one or two okay?

All opinions greatly appreciated.