Honestly for that price point, then narrowing to breed, you are not going to find much. Don't restrict yourself to a breed as anything bred decently with a smidge of talent is already over your price point. And if it's not then it's probably lame or crazy.
Just look for a horse with good conformation and disposition. There are a few breeds you can likely rule out from the get go. For second level I would not recommend anything with too much draft or arabian blood as they have difficulty sitting and doing the work. 1/4 would be fine if crossed well. Everything else is pretty well game, but be cautious of any QH blood and look carefully at the lines and the conformation. I had a 3/4 QH who was racing/ranch bred and a total stunner. Anything bred for halter, showing, cutting, etc.. will likely not have the characteristics needed though.
No idea where you are located but here are some horses I found who I would consider to be suitable for a low level dressage horse with the ability to do a respectable second level.
'Forever To Have And To Hold' at Warmblood-Sales.com
'AF Rafael' at Warmblood-Sales.com
^ this horse is a steal but watch the LF..
'Fendi' at Warmblood-Sales.com
^ a little more but IMO overpriced and not as nice as the previous horse. As well the rider is a little scary... She is obviously a sweetheart and a forgiving mare.
'One For The Girls' at Warmblood-Sales.com
'Cardod Sebastian' at Warmblood-Sales.com
So there are lots out there, but don't let a breed restrict you. Of course there are some guidelines you should follow, but let the conformation and disposition of the horse be your guide.
And bonus I found a horse for me to look at! Thanks lol :P