Re: Difference between RG450LTD and RG550LTD???
I had a 450LTD in Galaxy Black. Most important differences would be that it had the Edge Pro rather than lo-pro, and Wizard II neck rather than super wizard on the 550LTD. It also had a square input jack plate rather than the circular inset jack that the 550 had. I would imagine they had different pickups too but can't be certain.
Depending on the price, and whether you can deal with the thicker, rounder Wizard II, the 450LTD is absolutely no slouch. Mine was a very nice guitar.