Do you plan to make your tank a reef tank? If so, you'll need to overdrive your eclipse hood with some lights with at least 3 watts per gallon.
Regarding the biowheel. I use the biowheel on my ten gallon and so far it has not added to any nitrate buildups.
Since you're doing a nano tank, try to obtain a copy of the conscientious marine aquarist, I believe there is nano info in there. However, any saltwater book is valuable because you learn the basics and learn how things work... much different than freshwater. I got my books from the public library, so you can save some bucks by doing that. However, the conscietious marine aquarist book is a great resource to have and it's very fun to read.
With your nano you will want to use live rock as your filtration. That and a strong current and weekly water changes will do the trick.
I lurk at nanoreef.com but MFT has helped me out the most, by far. Just look through the archives of the nano and saltwater general section; many of my initial questions had been answered there. There are also several excellent threads about starting out. Check out OCCfan's thread about his nano, that should cover about everything.