Some fields require paintball approved goggles, so you may want to find out if that applies to you. Many of the players run ballistic goggles, full seal and other. I personally recommend at least ballistic goggles that make a full seal preferably with a thermal lens. It's worth the extra money. I do not recommend mesh goggles as they do not adequately protect from all velocities and bb variations (bio bbs shatter).
A half mesh mask is also pretty standard nowadays as it reduces the chances of shattering teeth. Make sure you find one that you can still get a good purchase with your cheek as this can get annoying fast.
Other then that, depending on where you play, gloves and boots with puncture protection may be a worthwhile investment because nothing hurts like having a rusty nail go through your foot.