If color is your only goal, I would add T5 atinics to you existing lighting, and possibly consider changing the existing MH bulbs to a different color temp.
If your talking about replaceing the entire lighting fixture because you want the other advantages of LED lighting, there are several possible choices. Since I've not used them all, I would not want to recommend any specific brand. All to often people recomend the brand they bought, and they have no experience with other brands. Also, many times people will say something like "I got the Acme SuperDuper one and it works great". Obviously this doen't convey any actual information that lets you decide what you should get.