I am going to look at a 2007 GTS 250 tomorrow. I have had a few scooters, but have never owned a Vespa. I know that there was an exhaust clamp/gasket issue with this model, but I believe there was a recall to address the problem. This scooter has 2,800 miles and a scrape/dent at the rear on the left hand side. Is there anything in particular (for this year and model) that I should be looking for as I inspect this bike?
I've got the exact same ride. Bought mine with 8900km on the clock back in August of last year, and have put another 7000km on it in one year of ownership (the previous owner didn't ride nearly as much as me). Mostly city riding but with at least a few thousand kms at highway speeds (+100km/h or 60mph).
I average about 72mpg (see my signature). I put a new set of tires on at 11,000kms, a set of Michelin CityGrips. Good tires can not have enough words spoken about them. If your tires are old or worn, the bike will ride like it's old and worn. The new tires gave me more grip and gave the scoot near-Cadillac ride qualities.
In terms of issues and service, I haven't had any problems. I do most of my own work, so after I bought it all the fluids were flushed, filters were cleaned, etc. Now that I'm at 16k I'm thinking of doing the oil again as it will have been almost a year since I did it last. Your potential scoot has so few miles on it that all it really needs to be tip-top is a fluid swap. Don't drive around on oil that's been sitting in the engine for four years as it will have the lubricity of pancake syrup and rusty nails.
Most of all, enjoy it. As others have mentioned, fuel pump recall doesn't affect the earlier GTS models, and the one real defect, the exhaust gasket that fails, isn't difficult to deal with, just know that it can happen.