A couple of Bala "Sharks" are great to watch too and interact well with each other
Red Sharks and rainbow sharks grow big but take time to do so and are only suitable when theres one of them but they're good on they're own
Dont buy Clown loaches at this stage as they are VERY susceptible to ich and although considered favourites can be difficult to care for
Sorry, sXeLifer, I'm not 'having a go' at you or anything, so don't take this personally, but NONE of those fish should be anywhere
near a 60l tank
The Bala shark, for instance, can grow to a foot long and needs to be in a shoal of at least 5 or 6...same for the Clown loach.
neon tetras are classics and a school of them look Uber cool as they have great colours and gleam so if you have say 8 or more they could always be the centre-piece
Cichlids generally will only get on with cichlids so avoid them
Neons are great, but do not do well in tanks that are less than 6 months old, even if they've been properly cycled. There are plenty of cichlids that get on with other fish; not all cichlids are as aggressive as the Mbuna you linked to! Apistogrammas, for example, make lovely community inhabitants and many people on this forum have them.
MasterHu; the play sand that you can get from B&Q or Argos is much cheaper than 'proper' aquarium sand and is just as good. I don't know what test kits P@H do, but most of us on here recommend the API master test kit, which you can find for £15- 20 on Ebay. It seems expensive, but will last you a long time and be invaluable to you in your early days of fishkeeping! You need tests for ammonia and nitrite as a bare minimum, but nitrate and pH would be very useful too.