I'd say go with the TM hands down, but if you want the G&G go for it. They're new version is apparently quite good unlike their first run which was one of the biggest production flops in airsoft history.
I've fielded the UTG M14 multiple times and I've gotta say that it's quite a gun. I wouldn't trust it with upgrades but if you're planning on keeping it stock then the UTG is well worth the price. If you put an upgraded Marui or G&G gearbox in it then you'd be fine. If worse comes to worse and you can't find a TM or G&G M14 for $200, the UTG is by no means a crappy gun.
If you can scrape another $55 together then I recommend Airsoft Extreme like Woogie said. I've been to their store in Santa Clara and they have some of the best products and service in the country.
i didn't think that you could put a G&G M14 into a TM M14 and visa versa. But yeah i was in the same boat you were a little bit ago.. I went with the G&G because of it already being at the FPS i was looking for. That and TM's are good but they are fairly low on the FPS scale. But that is what i have read on other sites, as i have not actually held a TM, well or a G&G till i get back from Iraq
But let us know what you plan on doing .... would be good to know
If you look at the Reticles for rifles AND shotguns you will see major differences.
Besides useful things like better and more advanced mildots, the shotguns crosshairs are WAY thicker. Most shotgun reticles are diamond in shape WITH the addition of the traditions crosshair "cross". The diamond shape is to view your groupings with buckshot and the crosshairs are for slug-fire.
In my opinion this is way to much clutter on a scope. Id rather use the space to aim what Im shooting at and view where the BB is landing to make Adjustments.
Im in no way exadurating the size of the diamond corsshairs.
The difference is almost literally:
Tradition Crosshairs: +
Shotgun Corsshairs: +