I used to press with United out of Nashville. I haven't done a record in several years, so I don't know what's going on with the pressing plants these days. When I did use them, they were great. It's probably worth your time to check them out. I believe one of my good friends uses Rainbow records now. I haven't heard of any problems as of yet. Rainbow is probably the closest to you, they are in Cali. I've heard multiple horror stories concerning Alpha vinyl in Florida. Seems you'd be best to steer clear of that one.
If you guys have the budget, I would do 500 press instead of 300. With the cost of pressing, sleeves and so on, it's hardly worth the time to do anything smaller.