I know it is hard to figure out what you want and what will work with what. I have learned a lot in my short time here and I am still learning. I think the hardest part about running an amp is to know when something is wrong with the system. If you buy used, you could buy someone else's problem but if you know amps then this might be the best value. Tube amps add another level of complexity as you have to learn how to adjust the Tune and Load knobs on the front. Its not hard to learn but you don't know what you don't know. Even if you get a new amp, it is possible that the input will need to be tuned for your radios output. Maybe someone with more knowledge can elaborate on that. I would start out with a small simple system like a Texas Star 500 and then upgrade it from there. If you look at the increase in signal by going with more power, it gets expensive real quick for the small increase you would get. If you still want something bigger then check this out.
You could get something like this for around $600.
http://www.jokermanelectronics.com/tnt-1200hd/
Product Description
Transistors 6x 2SC2879pp100
ALL box come in silver color now!! No longer in Black
Dimensions H 4 3/4' x L 11' x W 6 3/4'
Amp Draw (maximum) 120
Class B
SSB Delay yes biasing
Pre-amp yes
Driver Required TNT 250 (optional)
Power Output (RMS) 400 Watts
Power Output (PEP) 725 Watts
Driven Power (RMS) 650 Watts
Driven Power (PEP) 1200 Watts
install recommended with 2ga wire
and 125a fuse. Max input carrier of
25w or 450w max carrier from amp.
Max peak input 350w
I have had my eye on this one for some time. It is class B so it would work well on side band as it is cleaner than the class C that most amps are. If you are not worried about SSB then a class C would be fine and possibly save a few $. This amp would need a power supply and I would run three of the Mega Watt 50a in parallel. Model S700-12. They are $110 each.
http://megawattpowersupplies.com/
Hope this helps.
Chris 73s