AquaManta EFX 300 (or 400 if you can afford it!) will do the trick nicely! They are the quietest filter i have ever dealt with! They are very similar to the TetraTec filters, designed by the same person and made by Aqua One, sold through Maidenhead Aquatics.
Got new ones out with automatic primer buttons (not pump action ones, you just tap the button and it does it) and uv steraliser ones too.
The Fluval 306 0r better still... 406 is a good filter too! Still waiting to see how good they are, fixed the three billiob faults the 305 and 405 had! But not anywhere near as much filter media capacity as the AquaMantas. Also... i just think the more complicated they make the filter, the more parts there are to go wrong!