Re: RGT220H, RG3120 or RG8270
I'd go with either the RG3120 or the RG8270. Different feeling necks though.
Not a huge fan of the RGT220H, as I find the neck to feel too round and chunky. Not a bad neck but not quite my thing. Neck-thru really isn't all that much better, but it is nice to play high up. The J-Custom heel joint isn't a standard AANJ heel and is contoured more so it almost feels like a neck thru.
I had an RGT2020 in the guitar shop I used to work at (essentially the exact same guitar with an extra '0' in the model number), and for some strange reason it sounded tonally dead acoustically and basically just felt dead to the touch. Even tried one at another music shop and it was the same. Maybe I'm spoiled with my RG8670 and my neck-thru JCRG-2 but there's no reason why an RG1570 sounded better tonally.
(neck-thru construction doesn't mean it's 100% better than a bolt on, nor does it always equate to an immensely higher amount of sustain)