Nowt wrong with that Jim, part of the attraction of cycling is the fact that it's fun, and useful(transport wise) as well as excercise. Stick the bike on a trainer in the garage and you've just removed the fun and usefullness bits. Spend the money on a Winter trainer instead, whether that's adding to an existing bike or an entirely new bike. I'd plump for full mudguards, dynamo wheel, lighting and some heavier puncture resistant tyres. If you're going the entire bike route then throw in disc brakes and a hub gear, or SS/Fixed. Low maintenace, always ready to go and I like riding in the dark, what's not to like. The weather doesn't matter as you'll shower afterwards whether you use a turbo or go out on the road. You'll need to give the big a wipe down sometimes but that's not onerous.