You should incorporate both winning now and future into all rounds of your draft. Depending on where you draft (first, middle, end) of first round, you should target a young back with lots of upside. Overall in your draft, avoid aging players who are on the end of of their leash. People will be enamored with players like Brett Favre (my favorite player ever) and Marshall Faulk (who should have at least a couple big games). Both will be out of the league within the next year or two. While other owners snag up Marshall in the end of the first or early second rounds, you can target younger players who are on the upswing. Guys like Edgerrin James, Deuce McAllister, etc. are young, will help you this year and will be a staple for your team for years to come.
It also depends on how many keepers your league keeps. If it's only a two or three-player keeper league, you don't need to focus so intently on Kevin Jones, Fitzgerald, etc. because you'll probably have one or two main running backs you'll be keeping along with perhaps a Culpepper, Manning, Moss, etc. Then you can focus the rest of your team on players who will have big years THIS year and not so much down the road.
How many keepers do you have? How many teams in your league? When do you draft?