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I would like to mention some specifics of the community here:
1) It is very helpful.
2) It is very experienced.
3) It is creative in finding solutions.
Because of this you should specify your question more:
1) What is your budget on this project?
2) For what purposes you consider to use your laser? (Do not be afraid of detailed description.)
3) What preference for laser you have?
4)... (Add here anything you consider relevant.)
Without these points the community cannot give you complex help as there are many lasers and hosts available and each combination might be better for different purposes.
If you are new to lasers I would strongly recommend to stay in class 3B (IIIb) to gain experience before jumping into class 4 (IV).
BTW: Add your location into your profile to obtain best recommendation - maybe there are even some LPF members near you.