My parents have a pair of Jamo 503's with a 10" Jamo sub. They sound pretty nice. However, they are connected to an old Denon Pro-Logic receiver in a very asymmetric room. If they were connected to a better amp in a well-designed room I'm sure they would sound much better.
I bought a pair of jamo Dipole surrounds (can't remeber the model# right now), about 6 months ago and i love them. I got a great deal on them as well. $600 on sale for $300, brand new. From what i read, they can be alittle on the expensive side, but if you can get a deal on them, i'd say go for it. Like i said, i am so impressed with mine, they are everything i ever wanted in surrounds. Good Luck.