My memory is not so good either. But I investigated all of these in the past. I think TS doesn't offer HERB now. Schwab is the only one I can use. And $25,000 won't be a problem once I get paid. I am planning to buy a lot more than that.
Last time I checked Tradestation was pure horror now with OTC. Very few available and not HERB. Haven't checked for a few months though but don't think that changed.