I just upgraded to a 622 DVR HD (from an 811) and went platinum hd. I also have a 522 DVR - SD
This is how my bill is detailed:
DHP DISHHD PLATINUM W/ LOCALS $109.99
ADDL RECEIVER ACCESS FEE $6.00
DISH NETWORK DVR SERVICEFEE $0.00
DISH NETWORK DVR SERVICEFEE $0.00
CBS NETWORK-EASTERN FEED $1.50
CBS HIGH DEFINITION EAST $0.00
So if you don't qualify to the CBS-HD, then you bill would be $115.99 for Platinum HD with locals, and a HD DVR & an SD DVR
If you used the dual tuner function of the 622 for your SD set instead of getting a receiver, then your bill would drop by $6 to $109.99
As a new customer you would qualify for the $20/10months of rebates, essentially giving you your 622 that you pay $199 + tax up front for for free.
As far as a local dealer goes, Dish seems to use who "they" want when you are on the lease plan, for installations, upgrades and service.
I suppose if you have a local dealer that you know is good, you can initally go thru them.
You will need atleast component cables for HD, my 622 did not come with them. People are reporting problems with HDMI ports failing on the 622 so I hooked up component.
Great cables here
http://www.monoprice.com