My test rides lasted at least thirty minutes and I rode whatever I wanted. But these guys knew me and this isn't a big city.

Test ride some bikes, find the one that fits you best, then have the shop take the time to really fit you to the bike. Take that for a spin. If the LBS knows what it is doing; you should be in good shape.

Once you buy your bike, take pictures of it and post them here. The bike should be leaning against a white garage door with the chain in the large ring/small cog configuration with the crankside showing. Go ahead and flip the stem for that racer look. For best results, pose next to your bike in full team kit, Team Discovery is always a good choice.