If you want a great sounding mic at an incredible price....check out the MXL 2001. It's $99 and sounds almost as good as the Neumann that costs 7 times that much!
Other good choices are the AKG 3000, the AT 4033, and the Rode NT1...all under $300.
After you get higher priced than that - it will be hard to justify the price using a laptop system. The better mics ($700+) are more sensitive to breath noises, fan noises, etc. In a modest setting, a 2001 will give you unbelievable results. It's a large diaphragm, side adress mic that sounds wonderful.
Another great utility mic is the AKG 1000s, but that's a small diaphragm, and will not be as "open" as the others. The 1000 is my "Swiss army mic" - it does many things SO well. Guitars especially.
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