id say just about any ps/2 mouse will work fine, i havent any experience with solaris but i see no reason why a wheel mouse wouldnt work, as long as you have the right drivers for it there is no problem, if you are using xf86 it supports a wheel mouse. if you are going to use a GUI then a mouse is nice, but you should be able to get by by using keyboard shortcuts, and you work much faster NOT using a mouse, IMO. im using suse linux 8.1 with a wireless USB mouse (microsoft mouse actually!) and it works great. it all depends on if you have the right drivers.