I used 2 Hydor 300 watt inline with 2 Fluval G6 canisters. Although everyone on here bashed the G2 idea. Everyone praises Ehiem canisters. Go with what you like. The G2's are easy to service and they warn you when the mechanical gets clogged. Any canisters will work, do a little research.
A sump is nice if you buy the version that is predrilled. Unfortunately it's not available in high clarity. Canisters seemed more simple to me. I had to have the high clarity glass. I think it really adds to the rimless effect. To me sumps are great for high oxygen filtration and a place to stash you heaters and anything else you may need. I didn't want a wet/dry filter and inline heaters did the trick. I use a one inch diffuser for my CO2 and put it right underneath a MP40 pump for distribution. It works very well. You would most likely use twice the amount of CO2 if you we're using a wet/dry filter.