New circuit breaker panel recommendations?

[DenverGP]

Finally getting my central air and new heater installed. Existing panel is pretty much maxed out, had to do some re-arranging to make it work for now (still safely), but want to look at getting a new upgraded panel installed.

Current panel is 100 amp, 12 breaker, 24 circuit panel. All the breakers except the 2-pole ones are the "cheater" tandem breakers. Probably looking for a 150 amp panel?

I've done a bit of electrical work over the years, but not an electrician, so guessing this exceeds my capabilities.

Can anyone recommend an electrician in the denver metro area (SW part of littleton)?

Anyone have any guesses on how much $$$ I'm looking at?