ARRGGHH
Reset this thread, somebody. Eveybody is throwing crap all over the place, yet we don't even have the most basic required tidbit of information - DishPro or Legacy?
ALL STOP until we know this.
msynder: Go to your Check Switch screen and post back what it reads. Also, if convienent, look at the back of your LNB for a "dp" logo. If it's black paint, it's a Quad, if it's got a black background around it, it's a Twin. If it's not there, you're Legacy.
Now, to assume you've got a Quad (likely from your diagram). All you need for a switch is a DP21 (DishPro) or SW21 (Legacy). If you are DishPro, you MUST get a DishPro Single/Dual LNBF setup. If Legacy, you can use dang near anything - D* V* or old E*.
Get me the info on the current setup and I'll steer you right.
P.S. $30 for a SW21 is a RIPOFF.