I started with a $30 cheapo 10 years ago and it was life changing. Last year I got a stupid expensive one. Like, has a night light, auto flush (because I got the matching toilet), auto lid, heated seat, heated water, deodorizer, wireless remote, etc. (Toto S7A)
Just so you're prepared, the air dry doesn't fully replace the pat dry entirely unless you're gonna sit there for a good long time.
I honestly got used to the regular temp one. So much so that when I moved and the new house came with the fancier bidet, I just ended up using regular water every time.