The SMG looks very nice.
It costs 25 ec and spams just like a minigun but with high spread and better mobility.
Another choice would be the ak74sd. It is 35, but it's a classic favorite. It packs 8 damage with low freeze, and it's very fast. Fully automatic and smooth, a lot like the PWD SD if you know that.
Luger seems nice enough, I already have a Magnum though, and the freeze doesn't impress me that much.
Chemical RULES. It's like a explosive flamethrower with better accuracy, clip and another sub gun that shoots a poison slime shotgun that's very useful together.
Flamethrower is nice enough, it was the best before the chem and the minigun sucks because of its freeze.