Mike, I think you guys i the states have a bigger range of pumps, but something along the libnes of an eheim hobby pump, say a 1250 should do the job nicely.
As far as I'm concerned the sump (or wet/dry) wins hands down. You can hide all the gizmos in there, heater etc, also it increases the water volume considerably (normally) over cannisters. Drawback is CO2 can be offgassed but its so cheap as not to be a big issue imo. The biological filtering capacity is usually very high too.