Just thinking about your weekend is getting me excited!
If you only speak English, you might have a problem with the girls on the database as most cannot communicate so I would imagine it would be difficult for you to communicate throughout your session.
I would suggest hitting Neptunes and finding yourself a great looking Vietnamese girl. Typically before you deal, you can ask her if she would be willing to be part of a threesome with your girlfriend. I think you could be looking at about $1500-$2000 for overnight given this particular situation.
You can check out my thread on a Vietnamese girl I picked up at Neptunes. You may not be able to see the pictures but I assure you that she was absolutely gorgeous! (link:
http://forum.sex141.com/eforum/viewthread.php?tid=16253)
Just a word of caution: you might want to be careful about sticking your penis into the WG and then your girlfriend without swapping condoms. You wouldn't want the WG juices to mix in with your girlfriends.
Hope this helps.