well if your looking at a swap your going to be getting a jdm engine.. you can just forget about usdm. and if your getting a jdm engine and your obd2 and dont want vvt-i then you can forget a swap. now the real difference between going NA-T or just swapping in a 2jzgtte is the rods and the intake manifold and compression ratio. the NA engine has weaker rods and much higer compression so untill you lower the compression your stuck around 8psi on pump gas. and of course the awful non turbo intake manifold and its not so easy to just swap in the tt manifold either youve got to worry about throttle body position along with other things getting in the way. if your planning on really making a high hp monster i would go with the swap cuz in the long run it will be less expensive to acheive 800 900 or even 1000 hp if you really want to go that far. there are many nice NA-T kits tho i just got my turbonetics fmaxx kit on and i love it cost me 4000 for the kit and the install will be slightly cheaper than swapping in a new engine. the price actually comes out to being decently close for both of them. but going NA-T depending on the kit you get you should end up with a little more hp than a stock tt