2 Things of note;
1st - you should run this thru your atty, if for no other reason just so 2 different people have knowledge of this.
2nd - A wire transfer is totally safe. If you're *really* worried, go to your bank, set up a new account, keep NOTHING else in it, and have it wired to that. Once funds are rec'd, close account. Very simple.
One other thing--DO NOT let this languish any longer. He offered $$$, take it. Now. Drama ends.