At work I'm currently using an Enermax Aurora but I'm finding that after a couple of years of use, the keys have been removed that many times to reseat the rubber guide, that it's not working properly (particularly the space bar).
So, what do people suggest as a comfortable typing keyboard? It's not for gaming so I don't need fancy features, but I'm not adverse to spending out on something that's easy to type on. If it wasn't for the heavily worn space bar on mine, I'd have simply gotten another one.