Aiming for something in the $50 range is reasonable for a first pot

it's not so easy to find good pots under $100 nowadays, but not impossible.
For how many people are you making tea? If you brew pu erh gongfu style, you can resteep the same leaves about 10 times. So I'd suggest a pot around 100ml for 1-2 people (that will be 1 liter of tea over a tea session), around 150ml for 3-4 people.
There are some nice pots with dragon designs, but I am not sure if there are many in that price range. Usually the issue with pots with complex designs is that either they are cheap and very bad (trying to hide bad clay under fancy shapes) or very nice and very very expensive
