I would say that SKs are less played than monks, but I am not 100% sure about that. There is lots of gear for both classes, which can be obtained by looting, or questing as you level up. I would say there is less of an abundance of platemail in the early levels though, so that might be hard. But with the introduction of smithing there is certainly an option. There are some 100% weight reduction bags, as well as other weight reduction bags. You can buy two or so of the bags for anywhere from 200-500 plat (alchemist's pouch, burlap sack I think). When I leveled my monk I had a druid that I could loot most stuff with, so I am not too sure of how you would fair if you only played a monk for money that is. Like I said before though, there are lots of drops and quests you can do to gear yourself up. I have noticed alot of monks lately on SoD, but that might just be the time I play at. You should really make whatever class you want to. Monks do more damage, and can tank in certain situations, as well as pull. SKs can tank nearly anywhere, have some pretty nice spells, as well as being able to pull, however they do less damage. Its all really personal preference. If you can't decide on what class to make, you could always make both and test them out to see how you like them. It really doesnt take that long to get to the teens or low 20s.
Also I should note that lately there has been a lack of real tanks mid game. So although monks can tank decently, a SK would probably be more desireable for some groups, as they can tank pretty much anywhere up until you get to the endgame.
Also, at 65 I use my fist mainhand and a Wildstrike Baton in my off hand for the stats. I could use fists for both primary/secondary but I have not parsed my damage in both scenarios. Anyways, there is an abundance of weapons available to monks in the end game, and using fists or weapons is really personal preference as well. Hope this helps.
Jinxat.