As we seem to be stuck song writing wise at the moment I have been modifying some of my guitars.
Les Paul - TonePro bridge, Grover locaking tuners.
Eric Stratocaster - SuperVee Blade runner tremolo, Gotoh locking tuners
Mes Hino Strtatocaster - Kluson locking machine heads
All of this has vastly improved each guitar, and they were pretty awesome guitars to begin with!
I throughly recommend you try this before just buying another guitar.