Dave: What is the difference between the 408 and the Signature Limited? To me they seem quite/very similar?
Not that much mechanically, except the switching has a different layout (toggle vs blade).
The Sig Ltd has an Artist grade maple top, very dense mahogany for the neck and lightweight mahogany for the back. Upgraded woods all round, basically, plus a bound neck and headstock overlay.
Basically, the 408 is a regular production version of the limited production Sig Ltd.