Alter self allows you to disguise yourself as someone else almost infallibly, allows you to grow wings and fly, and allows you to grow gills and go swimmin'. Oh, and you can grow extra limbs and alter your weight. Sure, it's only 10 minutes per level, but you can have a lot of fun in that time. That's always going to be a fun spell.
Realistically, I'd probably go for teleportation circle and permanency. That would probably make me a mint in the right line of business. "Why, yes. Thanks to my amazing global network of teleporters, I can ship anything you want anywhere you want in ten seconds." It also gives me a reason to hire a small mercenary army to guard the portals, and I've always wanted my own mercenary army.
Oh, and prestidigitation is always going to be useful...
Final thought: I've always wanted to walk into the middle of some stupid Third World religious conflict looking like a hideous, twelve-foot demon, laughing and chortling, "Good work! All of you, keep it up!" With the right illusions, I wouldn't even have to be there. (Or I could, standing off at the side under a wall of force.) In fact, with programmed image I wouldn't even need a nuke-proof umbrella... (for such it is).