2 x HRP (1 Male + 1 Female)
1 x Geophagus Iporangensis
2 or 3 x apistogramma agassizzii
If you want a breeding pair thats when the problems start happening, especially with Central Americans. In that set up my prediction of what would happen is the HRP pair would kill the apistos and damage the geo quite badly. Then the male would eventually stress the female to the point of disease or death.
Also the Geos are a gregarious fish that need to be in groups in preferable situations. And while mixing dwarf cichlids like apistos with some South American cichlids I think they would be in trouble if mixed with the HRPs - even when not breeding.
A set up that would work in the format you said about could be.
2 Festivums
4 Cupid Cichlids or 3 Apistos - any species but smaller species of Apisto would work better, depends whats available.
or
2 Festivums
2 Krobia sp. Rio Xingu Red Cheek - Frisbies have these in great fish I have a pair but the ones there are larger than mine.
2 Laetacara Dorsiger
Then I would mix that with a large school of Pencil Fish or higher water tetras like Lemon Tetras - but I would not have bottom dwellers in there because the bottom will be quite full from the cichlids - though the way this tank would work is the apistos or cupids would take up most of the bottom and the Festivums would take the upper of the tank. The good thing about Festivums are an open water cichlid so take up territory in the upper levels of the tank rather than the base, the only other cichlid that does this is angelfish.
Equally the Festiums would work in the second set up the same way then the dwarf laetacaras and the larger krobia would work in the same way as the apistos/ cupids. The Laetacara Dorsiger are quite easy to swap with other dwarfs that work in pairs like Nannacara Anomala, Bolivian Rams, Laetacara Curviceps, Laetacara sp. Buckekopf or Laetacara sp. Orangeflossen.
For me the second set up sounds really really good lots of really peaceful South American Cichlids and you could get some nice schools to weave in and out of them. I would probs go for the Red Pencilfish that Maidenhead have in atm and a group of nice cories as well.
I'm not going to any of the fish shops for a few weeks

major cashflow problems but Ill let you know the next time I am going to one of the big shops if you want to come along. There are 3 or 4 big shops nearish Hull I go too for fish simply because the quality of their cichlids is higher than that of those in Hull - but Frisbies is quite good at the moment especially for the krobia I mentioned. One of the big cichlid keepers in Hull sold loads of his stock onto them a while ago and there are still some nice stuff in there - a good group of Guianacara Sphenazona in there as well at the moment one of the parents but a group of the young as well which would be a good fish for the set ups I mentioned.
Wills