Yeah, I agree.
Get a shure sm57 or 58 if you're gonna use it as an all round mic for everything.
For vocals and acoustic guitar, get a condensor mic.
I just bought a Rode NT-1 off ebay with shock mount and case for less than $100. Only thing to keep in mind is phantom power on a condensor.
You'll either need a separate power supply or a mixer that can provide phantom power to your mic.