As always with these things, I guess the first question is to determine how you are going to use the rifle. If it is a close range rifle, then it would be a fine choice to get a red dot or the like. If you intend to use it for shooting at small things at greater distances, then perhaps something with a little magnification would be a good idea.
I have always been happy with IOR optics. They have a few offerings for the 223 caliber family of cartridges which should work well with your rifle.
Also for a budget scope I like the Nikons.