I have many years been on the hunt for the long-wearing fret wire; I re-fret the top 7-8 frets every 6 months.Another rainbow I have never reached the end of, is the one which reveals a bridge that doesn't take your D and G strings out with painful regularity.
Apart from that, the oul' Limited Washburn, which I got a guy to re-strut, and stick a tail-piece on, instead of pegging the strings behind the bridge, works and responds absolutely famously.
B.