I have been using a quantum t5d with the h2.. so far so good... I am still experimenting with the wireless set up and comparing the manual, TTL, and auto modes
I use several systems with my H1...
I use Quantum Qflash 5D with dedicated Freewire (full wireless TTL) and QpackX. This is a 400Ws fully wireless TTL system designed for the H1/2
I use a Metz 54mz4 with an SCA coiled lead and the H1 dedicated module. This is a 60Ws fully TTL system for the H1/2
I also use a Broncolor Mobil in manual mode with radio triggers by studio flash. This is a 1200Ws system
I hope this helps.