Metric Man - Frames with an integrated seat post still allow some adjustment, however it is very small compared to a regular seat post frame. Integrated posts are great if you have a very fine tuned position and you plan to keep it forever.

djnzlab1 - If you're not sure about your fit going the LBS route is the best way to go. Make sure you find a shop with a good fitter and that is ready to sell you the right bike, not just what they have in stock. If you know what you need size wise, going the online route and having your LBS do the assembly might still save you some money.