Depends on what colors you like. I like the color of 10k bulbs, so when I switched from 10k XM 250w to 10k Reeflux 250w, it was perfect. They're still white, but accentuate a TON of blue in the corals. The old XMs were more purple/green/pink, everything but blue really
If you want par, consider upgrading your reflectors. I'm not sure what you're running, but if you switch from the typical spyder reflector to a Lumenbright/Lumenmax, you can expect to double your par with the same bulb. Yes, I said double. Granted, it will cost you a pretty penny, but it might also open up some bulb options too.