OS wise, it's fairly well priced (3.9). As for how much you'll enjoy it over another WB version, I personally still prefer WB 3.1 and the various ClassicWB type packs are very nice. If it's going on a UAE box, you don't have to worry about a networking stack.
Some people love 3.9, I sorta find it cluttered and gaudy, lol. It's hard to go wrong with a well customized version of 3.1 in terms of reliability and usability. 3.9 has a lot of doo-dads to modernize it, which is a pro or con depending on your preferences.