Yup, I have mine for sale, but I think it's a bit small for Gee if he wants to follow on from his Pseuda breeding success.
As for filtration, I would try a large sump (although I've yet to use one). Because of their versatility, capacity and efficiency (compared to several large externals). But I'm not the person to ask for sumps.
As for externals. Tetratec ex2400 is a beast but is too noisy and power hungry (60 watts). I'm not a fan of my FX5, too much mechanical vs bio media, and clogs too fast, ok power consumption (48 watts). Eheim 2080/2180 would be my choice, expensive but brilliant, very minor faults, low power consumption 25-30 watts). Give me a PM if you want my full opinion on these 3.