Well, there's about 3 oz difference between the Airweight and AirLite Smiths. Roughly about $250 difference between the two new. Not worth it to me, but that's got to be your judgement call.
You're right the local prices are outrageous. $500 and over for that Taurus is outrageous. I'm not proud of it, but I paid $430 (OTD) for my 85TI new. This was when they just came out and seemed, at the time, to be hard to find. I didn't want to order one and take whatever came, so I found this one new at a local shop. Recently, my favorite local shop had a Taurus 651 TI in the case new for $350. Took about a month to sell. Though I was sorely tempted, I had just bought a S&W 649, so I passed (my light CCW revolver is a Smith 642).
Look around at gunbroker and see if you find something that will fit your bill if you had it transferred into a local shop. Don't forget to add the transfer fees and shipping into your figuring. Good luck.