If you want a darker sand, check into the Tahitian Moon Sand from Carib Sea. I used it in my 75 gallon and it looks great. It is also very easy to clean. One simple rule of thumb on sand/cleaning: the amount of time it takes you to wash/clean the sand is in reverse proportion to how expensive it is. If you pay very little for the sand (play sand which I have in my 29 gallon) plan on spending a lot of your time washing it. It will take a while. If you pay more for it (Tahitian Moon Sand which is in my 75 gallon) you won't have to spend much time at all washing it.
I spent well over an hour cleaning about 30 lb of the play sand for my 29 gallon and the water was still so cloudy that I couldn't see the wall behind the tank 5 days later. At that point I did a 100% water change (no fish yet). I still had cloudyness after I filled it back up but at least it was gone in another couple days. Even now, if I move plants around or disturb the sand while vacuuming, I still get some cloudyness.
I spent about 10 minutes washing 40 lb of the Tahitian Moon sand and had absolutely no cloudyness at all. If you disturb it, it lays straight back down.
Edited for spelling.