90 KB/s (kiloBYTES per second) is around 700 kb/s (kiloBITS per second).

That's a pretty decent, standard speed, depending on where you are. Most ISP's sell on the kb/s rate so it's confusing when you see the KB/s rate.

Here is a table for comparison:
http://www.sunbeach.net/page.cfm?menuID=164

When you spend the big money for a T1, it's not because it's all that fast. In fact, most cable connections are now much faster than a T1. The difference is that T1's are a dedicated link between you and your provider, and are guaranteed to be at 99.9999% uptime. Also, your bandwidth rate is guaranteed (about 1.5MB/s up and down at the same time, or 3mb aggregate) which you can run at 100% capacity at all times if you want. The much cheaper cable or DSL connections are "burstable", which means that your available bandwidth is an approximation depending on how many other people on your network segment are using it at the same time as you and to what extent. Also if you overuse/abuse a burstable connection, you may have to pay more or in some cases your ISP will shut you off.