As for the swap/replace, it doesn't matter which one gets "replaced'. Despite being instructed otherwise, you stand a good chance of the installer leaving you with whatever box is deactivated.aphex said:
Don't count on a SWM. For the most part, HSP only have the SWM LNBs in some areas. It hasn't gone national yet. Also, it's still designated for new customers only, although your HSP may bend the rules. To add, only your HR21 and whatever HR2x the installer brings will work with the SWM LNB. The others will be bricks at that point.
So, if you want to keep the others running (HR10), you will either want to go the traditional route, ie cables ever where, or procure a SWM8 third party and have it before your install.
As for the tipping, thats a touchy subject for some. I'll just say if you want to tip, give what you think the time & effort put forth is worth and what falls within your budget.