[Test-Equipment] HV probe resistor selection

[Dave C]

I am rebuilding a Fluke 80K-6 HV probe that self- ... well, was the victim of too much DIY curiosity. 

I'm following this FAQ re. rebuilding it:

http://www.repairfaq.org/REPAIR/F_hvprobe.html

The original divider resistors in the probe were 85 Mohm and 85 Kohm which gives a nice divide-by 1000. 

I see that these resistors are appropriate for HV use and in the range I will need: 

http://www.digikey.com/product-search/en?FV=ffec498c

I've been thinking about what meter I want to put near HV. I have an old FET-input Radio Shack meter which might be good for this but it is spec'd at only 10 Kohm/V impedance on AC, and this impedance will change depending on the range selected. A cheap DMM might be a better economic choice -- little to lose if/when HV gets to it. But input impedance is typically low -- one on which I just checked the specs: ">1 Mohm". Preferred meter is a Fluke 117 (I do a lot of mains work) but the impedance is spec'd as >5 Mohm on AC range, not much better. Also, I see that auto-ranging can change impedance and upset the measurement ratio (series probe resistor and meter impedance) which could put the meter at risk of overvoltage(?).

Am I over-thinking this?

I know I can just duplicate the resistor values and leave it at that, but now that I understand the implication of meter impedance I'm trying to make some good decisions re. choosing new resistors and possibly a dedicated meter for its use. 

Suggestions? Ideas? 

Thanks,
Dave