I'm looking for 2017 GTI S in san diego too, and the best dealerships I have seen are either mossy, or city. Last month, mossy vw had a deal for 5000 off, and I bet they will do it again or be willing to go that low to get a car off the lot.
Let us know where you get it from because I will probably be getting my mk7 in April when my current mk6 lease is up. (I got my mk6 from murrieta vw, which was good, but could have been better now looking at it)
I went to Kearny mesa last month and they quoted me $26,200 for a 17 sport dog but I'm trying to under 26k
But also I would wait till the end of this month to really go in and get serious about buying it, the best day to buy a car is always the last day of the month when the dealerships need to sell cars to meet sales goals.