I could buy a Trinity only for the looks...big blue touchscreen, aluminium...wow! And it also sounds great, has an excellent effects implementation, and the touchscreen is a wonderful bonus: all the interactive devices in the future (from synths to computers, Hi-Fi, videotape...everything!) should work that way. But the EX5 has a far better polyphony, great sound generating resorces, sampling...
It' s a difficult choice. You could also try a Roland XP-80/XP-60 (same thing in 76/61 keys suit), and get mad trying to decide which expansion card to buy, or the new Generalmusic Equinox, which I've read is as good as a workstation in his price bracket gets. Good luck -whatever your purchase is, you'll hardly be disappointed.
Hugo.