I've just bought my first serious bike (a Marin Kentfield) about 3 months ago and it got me back into biking/commuting. I commute 4mi a day on suburban roads.

My interest in SS was first sparked by a test-ride on a Mongoose Sabrosa 1x1. At the time, I couldn't afford the Sabrosa with the situation I was in. I'm now considering saving up up to $650 for my next bike.

I'm thinking I've got several choices: Kona Paddywagon, Bianchi San Jose, Specialized Langster/Gangster OR I could go with a lower end bike such as one of those bikesdirect bikes just in case I don't like commuting on an SS and decide it's only good for occasional light use instead of daily commuting.

Suggestions?