[Antennas] Antenna lead in coax

[Jim Isbell]

I am planning a linear capable of 2.5KW PEP on SSB up to 30 MC. 
 (4-1000A at 4500-6000 volts plate)

I want to make sure my antenna cable can handle it.

In looking at cables I find that LMR-200 (Hi Performance RG-58) is 
capable of 1050 watts at 30 Mhz.  Just how much does that translate to 
in power level SSB PEP?  Is there a rule of thumb for compairing cable 
power capability when I assume that the number usualy qouted is for CW 
power capability?

RG213 and LMR-400 look like they could easily handle my power output but 
are a bunch more dollars.