$300 bucks is tough - save more $$ - you still need a power supply, coax & antenna.
You should look at:
The Alinco SR8T - new at HRO for $530 - shipped to your door. 100w HF rig. See reviews here on eham.
Power supply - Astron RS-35M or the SS-30m - both good to go - Price $189 or $149 at HRO.
Then get some good coax - 100ft is common ( use as little as needed to get job done) however I like to see my antenna at least 50ft away from my operating position. - 213, or 9913 or 8x if want to save some $, but still decent.
Many antenna options - a vertical in many cases is the simple solution - give the antenna type the greatest consideration - But I have operated with anything from a MFJ hamtenna to a 3 element beam, vertical or wire antenna.
73 K1WJ David