S9? 2950? 2970??? heck, the 2970 could quite possibly do as much or MORE then a texas star dx250!!! it is a LOW DRIVE 2x2290 amp, designed for 13.8 volts & to make around 40 or 50 watts carrier & 160 watts PEP. more or less. it is an extremely durable, well built class AB1 amplifier designed for a stock, single final CB. though not my 1st choice, if you plan on a NEW CB, the ONLY thing that fits YOUR requirement of SSB & the amps requirement of 'low drive', would be one of the newer texas ranger SSB, LEGAL CB radios.
before somebody adds their 2 pennies worth, you could make a dx250 work with a connex 4600 or whatever the heck that high powered thingie is they have. but, why? if 557 already has a dx250, i assume he has the funds for something in 'its' class, radiowise. if HE would prefer a 2970, then, maybe sell the dx250 & add that cash to what he has & go for a bigger radio. THEN, he'll want a bigger amp, and a dx1200 or 1600 will be workable......
557, look at a tr966, 959 or something in that class. the receive is better then the 29XX radios, & your dx250 will make it xmit just as big!