Well in the lfs today I saw midnight emperor tetras (mostly black, but with blue eyes - quite cool), silvertip tetras, serpae tetras and they also had albino tiger barbs which were quite pretty, but I'm not 100% convinced by any of them...
I guess I'll have to wait until I have everything else in there and then see what's available. Can't add fish til next wk at earliest and then it will be gouramis assuming I can find some by then. Probably no point in deciding now because I'll only change my mind!