Best fish for 10g

Burrowing gobies, a single damsel, a pair of clowns, firefish, and Ecsenius genus blennies would all be excellent candidates for a 10 gallon tank. A damsel and a pair of clowns should be fine together provided enough rock work and compensation for the high waste load.
 
The problem is that you have a small tank. The bioload from a pair of clowns (which really require a 25 gallon tank) and a damsel is greater than your tank will handle. The smaller the tank, the greater the risk when abnormal situations happen. The pair of clowns, which need to hold 25 gallons once mating, and will be very aggressive when then do start mating coupled with another aggressive fish, just won't work. The bioload will simply overwhelm your capacity. If you want more fish, get a larger tank.
 
You could have one or two small, low bioload fish, and then focus on cool inverts (like scarlet reef hermits, small colorful shrimp, small feather duster, a couple small snails.) This is what I have in my 12 gallon nano, and it is a very active, colorful tank. Add in some zoa and mushroom frags, and a bit of decorative macro and/or a small ball of chaetomorpha, and you could have a nice little tank. It is very easy to overload a 10 gallon tank with fish.

The smallest size for a decent marine fish tank, IMO is a 25 or better yet, a 29.

FYI, in my 12 gallon nano:

Several really nice looking pieces of cured live rock

High fin red banded shrimp goby
http://www.liveaquaria.com/product/prod_display.cfm?c=15+2124+181&pcatid=181

Small tiger pistol shrimp (may have to move and replace with smaller pistol as it grows)
http://www.liveaquaria.com/product/prod_display.cfm?c=497+525+1148&pcatid=1148

Several small saltwater ghost shrimp (feeders for my scorpions) - I put a few in this tank, they are very active and engaging

Two scarlet reef hermits
Assorted snails, including small Nassarius, Nerites
Dwarf feather duster - pink and white, a centerpiece in the tank
Assorted zoa and mushroom frags
Chaetomorpha
Some pretty red macroalgae - two species (came up on the rock)
 
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I have a couple zoa frags, a pulsing xenia, green star polyps, a candy coral, and I think it's an open brain in there now. Have a scarlet hermit with a couple regular hermits, and two snails. What do you think the "coolest" fish are that I could get away with. Just something colorful. I would still like to get at least one clown
 
I'd get a small ocellaris clown. You may end up wanting to move it as it grows. Another fish to add might be a small orchid dottyback. Depending on how they get along, and if you keep up with water changes, tihs might work. A smaller fish, alternatively, would be a neon goby.

Just watch parameters, minimize fluctuations, and keep up with water changes.
 
Just my .02. I can't imagine keeping anything more than one very small fish in a 10 gal for long. A pair of Percs and a damsel? A wipeout waiting to happen, IMO.
 
Just be aware that many fish, even "small" ones, will outgrow a 10 gallon tank. I'd put a full grown orchid dottyback in a bigger tank than a 10, clownfish too.
 
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