As a singer first lead voices don't concern me too much as they are all up to par for accompaniment and solos for a singer/player. It amazes me how little people use sounds anyway in their performance demos songs...mostly I hear lead piano, but not alot of changing instrument lead sounds thru-out the song which gets boring to the listener imo...
I could not agree more and have already written about it in several of my reflections. Nearly all of those who actually sing and use their arranger as a backup band will use very few different sounds for their right hand than piano, guitars, sax, brass and the occasional accordeon or other sound.
The quest for more and more sounds is pretty absurd unless you want to become a 21st century Jean Michel Jarre or perhaps another New Age guru (haha !!) which brings me to re-iterate what I said before:
If you are a singer your first choice will be the PA4X or SD9 and if those are too expensive the PA1000 or SD7 will be a very worth while second choice imho.
If you only perform instrumentally , either at home or on stage, my first choice would be Genos or otherwise a used Tyros or the new PSR 975. Enough said.............
regards
JOhn