If you don't already own the following albums, check them out, they are must have's and changed the way I looked at the guitar:

1) Jason Becker - "Perpetual Burn" - the must have album above all others (buy it from his website cos he's sick as hell and needs the cash)
2) Vinnie Moore - "Defying Gravity" - a lot of different styles on this one (unlike the older stuff) including neoclassical shred and spanish guitar
3) Theodore Ziras - "Virtual Virtuosity" - amazing neoclassical that uses rock foundations (verse chorus) - this guys technique is flawless
4) Symphony X - I hate the singing but Michael Romeo guitarwork is brilliant and he writes a lot of orchestral parts with symphonic sounds, very progressive and original

Check em out!