Best amp for 6 ohms speakers

If the speaker nominal impedance is 6 ohm and has a relative benign impedance swings, then almost any amp will work.

What you need to be concerned with is how the impedance changes with a change in frequency. Some speakers that are rated 6 ohms will dip down to 2 ohm, which can be problematic for some amps.

You ahve not specified the speakers nor the budget. So someone might recommend a top of the line Pass.

I use Parasound A21 with my 6ohms Quad. It is more than sufficient with a Passive TVC.

Some amps overheat if the load falls below 4 ohms...you should
check the amp ratings first.

I'm using Episode 700 monitor speakers rated at 130 watts RMS, 325 watts peak. I'm looking for an amp at $199 - $299 that's capable of driving them.

Those speakers are 89db sensitive so they should be pretty easy to drive. Are you looking for a power amp or integrated amp?