Here is the other side that I would like to add in here... I am an advocate for Peacocks because of less agression... however.. The all male idea is worth while to consider. The 1m/4f thing works great for breeding but you end up with 3 or 4 colorful fish. I propose overstocking with all males of different species. Again you can go through that site I showed you. That guy at KG Tropicals knows his stuff and instead of going and paying LFS prices, get the 1-2in fish and let them grow up together as all males. Also if you really like the yellow labs, that is one of the few mbuna I would keep with other africans.
I still think if your bang for your buck experience is what you are interested in (that is color is more important) you could add in some cool fish without the idea of stocking females.
**word of warning - do not stock more than 1 male of any kind.
FW: 1 45gal, 1 40gal, 3 10gal, 3 30gal all community tanks of different species
Sw: 1 55gal, 1 30gal show, 1 29gal show, 1 20gal and 2 10's