I own Halion 6 and Xpand2!. The sounds are simply not near the quality of my Yamaha Motif. Does anyone know of a really good VST MultiTimbral synth with acoustic instrument sounds such as brass, woodwind, etc that is not the two I already mentioned?
Have you looked at the Roland stuff? JV1080 and SRX Orchestra would do it, but, of course, there is that nagging periodic charge. I have been an E-MU guy for many years and a lot of it is free now. It is samples, but sounds great. There is also Korg M1, very light on on load. Pretty good sounds for live work…
My suggestion would be Native Instruments Kontakt, if your budget can run to it. It comes with a huge library of bread and butter sounds - with the option to add your own and third-party library material later.
I think the latest EM mag compares HALion and Kontakt, two really high end, multitembral, samplers. I have both, I use Kontakt. I keep trying to remove Kontakt from live use, but it just keeps coming back.
Coming at it from another angle: a lot of the “sparkle” of the Motif sounds comes from its effects (which are definitely sub-par on the Xpand2!). But if you add some nice effect plugins to your Xpand rack, you can pimp your Xpand sounds massively! A bit of EQ, maybe some exciter, reverb/delay to taste - different sound altogether!