I use a Fireball V mic thru my keyboard amp, a Behringer K900FX. It gives a clean sound, but if I wanted I could add a guitar pedal to get distortion. I have spent so much on equipment this year, I can’t justify any more equipment until my harmonica playing gets much better.
A lot of Blues players like to use a tube amp(guitar) and crank up the gain for distortion and more bassy sound and usually they use one of the bullet mics.
If you are looking at amplifying, take your time, and TRY different amps and mics. That way you can find the right combination. Unfortunately, that may not be easy to do. It may be hard to find the type of mic or amp you want in your area and you may have to purchase something from a company like Musicians Friend. Fortunately, they have a 45 day return policy.
Good luck and keep on harpin’