If you have a foundation license, you may want to to see if you can find a good used FT-817ND. It will give you all the bands from 160M to 70CM.
I bought mine for 400$ used with all of the accessories form a local ham.
If you do want just an older HF rig, there are plenty out there. But there are few things going with this route.
The first is you will not get 6M with most older rigs and some operating modes.
The second is condition! Make sure you try it out before you buy it.
I would also recommend that you hit the RSGB website and see what clubs are close to you and contact them about any used rigs that might be for sale and if there are going to be any ham fests happening in the near future that might have radios for sale.http://www.rsgb.org/http://www.rsgb.org/local/