This orchesttral version of the piece for two pianos was, as it is well known, written by Lutoslawski himself. I produced it all allone in summer 2009 with the samples of the Vienna Symphonic Library.
It was quite a lot of work as it was fun to programm the soloist aswell as the complete orchestra.
Since this popular piece is in no version part of your collection jet, this recording might perhaps fill this gap.
have fun with it.
best
fahl5