Contributing to an HSA

I have been contributing to a HSA the last couple years, and it's been fine. My work contributes $1800 over the year and it hasn't really been a problem at all.

Now I have a kid and a spouse on my insurance, and they tend to go fairly often it seems. The copay and deductible on the HDHP is a bit crazy and I'm thinking of swapping to a PPO. Is that a good idea, or is turning down the free $1800 from my work a no no?

Here is a link to the plans