I don't get peeps that run on holiday. Unless your top notch elite a week is not going to make much diffrence your body needs a rest once in a while so do it on holiday.
I love running in new places. Whenever i go somewhere either on holiday or work I always try to squeeze in at least one run. Nice to see something new and the software I download the GPS to puts a red dot on the map where I log a run, its great to see the number of different places.
As others have said DC Rainmaker will tell you more than you ever need to know to make the decision so check it out.
I have a 110 without HRM and it is perfect, robust reliable and pretty accurate. The sattelite lock takes a little time but not sure if the 10 will be much different. Based on my knowledge of the 10 I would go for whatever is easier on the wallet.
PS the charging clip is fiddly but not a major issue
You have two options train harder yourself or go rogue. try modifying his diet to leave him lethagic for training. Disrupt his training plan with offers of food and/or sex before he heads out. My Wife (who just happens to be in charge of houehold laundry) seems to be able to have every piece of running kit I own in the wash at the same time on a very regular basis.