1. What speeds are T1/T3, etc. for LW, ___ 2. More on LW connection speeds ___ 3. What is a T1?

No specific best port. Whatever port works & is free. Ports 49152 or higher are the least likely to be blocked or shaped by ISP's & are not officially used for other purposes.

Without rechecking the links, if i were you, I'd set myself up for T3.
I have a similar upload speed but if I set myself up for T3, then there's issues with setting maximum upload speed. Ideally you'd like to set free some bandwidth for browsing, etc. BTW my download speed plan is 24 Mhz, but I get less than 4 Mhz due to line speed issues. (ie: the line/cable/wires the connection runs thru is not designed to cope with faster. They are slowish upgrading all lines around here. Besides that, speed losses are also due to distance from supplier, losses over connection equipment, line hops over ISP's & possibly those that shape, etc.)