I've heard of some issues with the Gen 4 guns, rumored to be caused by the slight differences between them and the Gen 3's. For this purchase, though, it simply came down to price. The retailer in question (not really local, but relatively nearby) was trying to unload a good number of Gen 3's at the gun show I was at, and they were going for about $100 less out the door than the Gen 4 prices before tax. If I could have found either a Gen 2, or a used gun that wasn't beat to shit there, I would have opted for that, as I probably could have gotten an even better price. But this being eastern NC, my local purchasing options tend to be limited at times.
ETA: The RTF2 texture was also appealing, as it gave me a couple options (straight RTF2, slightly sanded RTF2, or homemade stippled) of grip style to best suit my wife's preferences. She's already said that she doesn't like the RTF2, so we'll try sanding to ease it out a bit. If not, I'll be spending some time in the garage with the soldering iron...again.