BIG +1 on BCP's comments once more.
Knowing what you want to spend will go a long ways in helping you with some options. Like most things AR-related...options range from fairly inexpensive for basic aluminum free-float tubes to ~$400 of some of the "high end" components.
The Troy handguards, as well as the JP/VTAC handguards are very nice and offer a good deal of flexibility in terms of how you set them up for rails/add-ons. Apex also makes some damned nice offerings that are textured and offer the same degree of flexibility as the others in terms of adding rails where you want/need them and leaving other areas well enough alone...they also won't break the bank at ~$200.
Don't count out excellent offerings from Seekins, PRI, Lancer and others as well, but those will come at a slightly (or in some instances, considerably) higher pricetag. Again...its tough to point you in the right direction without much more info to go on.