I've been commuting via Raleigh MTN bike year round for 3+ years and love it. The Raleigh is in fine shape but I want to try out riding for commuting and exercise with a single speed. I have an oportunity to build one with a Bridgestone 300 frame. Should I do it and how much is too much to invest in it? I would keep the MTN for my winter commutes. Thanks!