This is my favorite wine shop in all of Metro Detroit. They don't have the widest selection but they have *by far* the best prices on the best wines in town. There's always someone on staff who knows lots about wine and the shop owners have a penchant for picking out excellent wines. You can usually find a great bottle of Cab for about $6.99-15.99 that would go for $12.99 - $30 elsewhere.
If you're looking for an insane selection head out to the Suburbs (I prefer the Wine Barrel in Livonia or the Wineshop on Livernois and 15 in Troy). If you're looking for a shop that sells good wine at great prices, check out Cost Plus.
They even wrap your wine bottles in copies of the Metro Times :)