I have Starband...it *is* a two way satellite service. I also have two additional land line ISP's, both using different backbones plus I have two pots phone lines....
With the dish, you'll want to consider the latency issue as ping times can go as high as one second. Really! That's one reason why I use the phone line for order entry and the dish for the data feed.
The dish really shines when it comes to bandwidth...I've tried to use a single phone line for the data feed and, regardless of what you've read elsewhere, you may miss some ticks, depending on how much data you demand. In my case, I use a squawk box service and there's no way a single phone line can carry both data and the squawk box.
Another thing you may want to consider is multilink. Some ISP's offer it and I use it from time to time when the weather is really bad and the dish isn't reliable. Multilink is simply the merging of two modems and two pots phone lines to give you more bandwidth...somewhere around 80kbs to 95 kbs. I really like it...low ping times and great bandwidth but like any dialup, reliability can be an issue.
In the rural area I'm from, there are no dsl, isdn or cable modem services (thank you, Verizon. )It is just the dish and a couple of phone lines. Frankly, it really sucks. If you're in a situation such as mine and you want to *really* trade stocks, then consider (drum roll) a T-1. Major bucks...around $900 a month for a burstable T-1 according to UUNET plus the router and installation.
I just spent the better part of a week ckecking out a proprietary firm and there is no way I would try to compete with those guys (from my location) with anything other than a T-1. If I join the firm, and I'm seriously thinking about it, then for sure I'm going to use a T-1. I know that it sounds like overkill but I sure as hell don't want to blow any trades just because I was too cheep to use the proper tools. Besides, you get a 100% write off at tax time.
Best regards, Jim