I use a 60-100X, works awesome, i mostly use the 100X setting tho. be careful, a spidermite at 100X magnification is a scary muthfukr.
some people might not have much dexterity, its not really hard to hold a scope steady
had sent this to someone earlier in a PM:
if you dont have a lighted microscope, get one. for the 10-12 bucks they are totally worth it. Look on ebay, you can also get a USB microscope for around 40$ and then you can see them and take pics right on your puter.
this is the one i like. :
http://www.ebay.com/itm/300636795458
and this is totally badd ass also :
http://www.ebay.com/itm/SVP-Handheld...-/251022791962