OK, being a scrounger at heart, (po' folks got po' ways...lol) I'd say start scouring the neighborhoods and even the rural areas for old Primestars and any other dish people may be willing to part with. (If you find on old mesh C band in your travels, consider dragging it [carefully] home too (it may come in handy, hint hint.) For Ku stuff, I recently picked up an old 33" that was for I'net downlink for just asking, the new homeowners had set it out by the trash.
Unless you plan on subbing to Dishnet or DTV, with their IRD, dont bother with those dishes. They are too small and the wrong signal orientation (circular) to be used for True FTA.
As for a receiver, for a 1st timer on a buget, just about anything DVB capable will get you into the hobby. I'd browse Craigslist and see what is available used locally in the $50 +/- range. The discontinued 1st generation Coolsats and Viewsats will fall in this range and are quite suitable for True FTA. That's just 2 of dozens of DVB rx's you may come across. One thing to look for when buying an rx, especially a 'low-end unit' is a feature called blind scan, or smart scan. It isnt essential, but is very useful.
Which is better is totally subjective. In a given class, they are all built to similar specs, and all have productionline good ones and lemons. For example, I *think* my Coolsat 6000 seems outperform my Viewsat Platinum and Extreme, therefor i prefer it, but I have no lab standard test equipment to verify it actually performs better. The VS's do an acceptable job on C and Ku as well.
You will still need accessories, coax, maybe a new linear LNB if you find a dish with a bad or missing one, possibly a DiSEqC switch, and maybe a pole to mount the dish on. You should be able to get all this for under your budget and leave you some 'play money' to add to your soon to be 'FTA hobby kitty'. If you end up like the rest of us, your going to need it.......lol