IMO it is always better to have more water volume for stability.
All you need to start is the tank, saltwater, live rock, heater and a powerhead. Then it can just sit there maturing while you sort out other things (lights, skimmer).
The 150W would be prefectly suited to a 120L with a 14K maybe if you want looks over growth.
You can keep the clowns and cleaner shrimp.
IMO go for clowns over the agressive little damsels. Plus that swim funny :lol:
Here is brians old tank: nice and simple
http://www.fnzas.org.nz/fishroom/briane ... t5171.html
Next step up to that in terms of simplicity would be wasps, and he has an incredible tank.
Also you should talk to land_lubber, who has recently come over from fresh and set up a salt tank.
Good luck
Kyle