When you say ntop is no use -is that because you had problems using ntop, or that it didn't give you sufficient info?
You could install the pfflowd package which is a netflow emitter - I only played around with it a little and found some netflow collectors didn't seem to like it as it didn't totally conform to standards.
This thread http://forum.pfsense.org/index.php?topic=11185.0 mentions people being happy with Manage Engine's Netflow Analyzer Pro although the thread also mentions the free version only supports one interface. (and you need to run this on a box external to your pfsense)
Also if you are at the console or can ssh in, pftop gives real time info, and according to this thread http://forum.pfsense.org/index.php/topic,11289.0.html the bandwidthd package can also give per ip info.