I got my tune done at AWDTuning last month. Keith is a really nice guy and seems very knowledgeable about our cars, despite the parking lot being full of WRX's and STI's. I feel that he was very thorough and did a nice job on my car. It's been a blast to drive since I got the tune done.
The area is pretty flat, so should definitely be friendly if you're lowered quite a bit. Can't see my paperwork since I'm at the office right now, but I believe he charged me $650 for the UpRev license, tune and before/after dyno runs.
I, like you, went to Alamo Autosports and didn't get a great vibe from the place or the staff I spoke with. This is my first sports car, the most expensive car I've purchased and the first time having any mods or work done to a vehicle, so I was understandably nervous going into this. I felt in good hands when I went to visit AWD though, so that's why I decided to give them my business. I live like 10 minutes from Alamo, but AWD was totally worth the hour drive.
If you go to AWD, tell Keith that Kris with the 2015 Nismo sent you.