The first thing I suggest you do is find a local dealer or two, talk to them, get to know them, and tell them your situation.
(If you buy on-line, you will need them anyway for the transfer.)
It is always better to know a local dealer you can trust.
You can buy a lot of protection for $700.
I just purchased, from my dealer, a used Sig P229 (9mm) for $395.
The weapon was a trade-in from a local police officer.
There is absolutely NOTHING wrong with the weapon.
There is only a little wear on the bluing from the officers holster.
It came with two 12 round magazines, manual, and the original case.
It has smooth action, flawless operation, is very accurate, and is possibly the best weapon I own. (Also have a Walther PPK/S .380, Bersa Thunder .380, SKYY 9mm, and a Glock 17 9mm)
If you are able to find a deal even close to the one I got, and your budget is $700, you should have enough remaining to get plenty of ammo, a holster, a cleaning kit (a must), and take the wife to dinner.

Hope my ramblings help.