Fryei are one of the few haps that you could make work with hongi and labs in a tank like that. Still gonna be hit and miss. No magic potion or forsures with Africans to begin with but it's up to you. 44inches is somewhat short length for the species you're referring to. Have you checked maybe on Saulosi or cyno white top haras for options with that size of tank?
The problem is that you need the tank somewhat crowded, the tank is not that large. Since most of the cichlids to choose from are similar and you want those that keep good colour, you can hope they get along and colour up. Doesn't always work thou, it has an element of randomness.
Aulonocara you've got to choose from A. sturatgranti types and A. jacobfreibergi types. You can try to get a mostly blue peacock and a mostly yellow peacock, and hope they are not offended by each other, but they are very closely related.
Fryeri can work, but tend to be more dominant that Aulonocara, end up being too bossy. Fryeri X Aulonoacara hybrids are common, and may be more peaceful.
Now if you choosing the cross genera hybrid "Peacocks" those get along better with Mbuna, and you can have more a Mbuna mix. If using hybrids, many will have some colour no matter what, and at least it is not wasting a pure quality fish.
i have been looking around lfs to see what they have (i wont be stocking until cycle is complete) and none seem to have peacocks, so is there a good UK website that sells them? and is it possible to sex them because i don't want females?
Yes id avoid socolofis and aurautus in that size of tank. Maybe labs, afra and red zebras. Labs and red zebras are notorious for cross breeding but if you're not looking to breed they make a nice color combo and the afra would give you a nice 3rd species that's barred