A 14 inch is plenty. You'll have more than adequate resawing capacity for just about anything you want to do. I don't know if you are a fine woodworking subscriber or not, but here's a link to,their most recent bandsaw comparison.
http://www.finewoodworking.com/2014/...14-in-bandsaws
You have to subscribe to fine woodworking to be able to access it. This article says Laguna and Powermatic are best overall. Laguna and Steel City (no longer in business) tie for best value. Grizzly is also highly rated. I have seen a lot of good reviews on Grizzly.
Whatever you do, make sure you get cast wheels and NOT aluminum wheels. Heavier wheels gives more momentum hence less chance of bogging down.