IF your mechanical talent is limited look for a good quality rear hub motor, controller, pack and throttle kit. Be careful on EBay...lots of crap being sold but also some good stuff. But if you have the time and talent a good chain drive will do a lot better on hills and the falts do to the correct usage of the bikes gearing. I have used Cyclone kits (small 360w) and they worked fine even on hills that you could hardly walk up let alone ride a bike up. This is not to say I recommend they though. They can be a hassle if you don't set them up properly. But there are a ton of other chain drive setup to consider. I personally prefer to buy a motor and make my own custom setup for the bike. I will be starting my 5th ebike build this winter. But as I said if you don't think building is your thing don't do it. BTW, Belt is quiter then chain but a lot harder and way more expensive to work with.

Bob