if you're talking about straight ssl acceleration, check out bigip ecommerce package, or the 1000 series box. i also evaluated rainbox technologies ssl accelerator card for the server (cheaper solution) but overall, it comes down to how much you want to spend as well as scalability, etc... the most important thing is to identify how many transaction you're going to have through ssl, most ot the time vendor is going to throw out some large n tps, etc...

--w0rm3y