Kissing gouramies don't have long flowing fins. In fact, kissers are one of the few of the commoon gouramies that lack the long ventral feelers - makign them a lot less susceptible to being nipped. The also get considerably bigger at 8" and can handle aggression as they can be considerably more aggressive themselves.
Having said that, I agree with Cavafish in that you CAN bend the rules - a large school of tiger barbs is a lot less nippy. If you add a few more barbs at the same time, you may be able to avoid confrontations altogether. On the other hand, it could be a complete disaster and you'll need to do something about it.
Also, I replied to another thread where you were asking the same question and I mentioned there that your gouramies could become a problem for you in future. I don't know whether you've seen that or replied yet so I thought I'd let you know that gold gouramies (and other three-spots) can be very territorial and males can go as far as to kille ach other. They are ok whilst young but get increasingly more aggressive as adults.
