XM 20k's are very nice, the reason I switched to the reeflux 12k's is because I am looking for a little more growth.
if you are gonna do DE bulbs I would suggest pheonix. they have a very nice color.
I can't say anything about the odyssea except that I tried a couple and they burnt out in less than 3 weeks, all four of them so I will never do the cheap route again. my live stock is worth more than that.