You will be happy with the radiums. I loved mine. They lasted forever. They had almost 2yrs use on them when I got rid of them, and they still got great color, gave me great growth. There is something to be said with buying a good bulb.
I got a retro kit that I traded off my 400w MHs for. It is a six bulb retro with Tek II reflectors, not sure on the bulbs yet, and 2 660 ballasts. I will use that all for now, but I might upgrade to better reflectors later on. Was thinking of the IceCaps or the ATI reflectors. I have heard that reefgeek I think it was had top notch ones, but you have to ask for them, they don't advertise them yet. Just more stuff to play with.