Armor Pen for MM Hunters

[Elephants]

Do I need to strictly gem Armor Pen for Marksman? I heard it helps but I am curious if I really do need it.

[Destruyen]

elitistjerks.com has some nice hunter info, including a spreadsheet to plug your item values in and see what each stat's value is for your gear.

also, there is a sort of online spreadsheet from femaledwarf.com that you can plug in different gems and items to get your best gear set.

Marksman questions - Page 81 - Elitist Jerks
Zeherah's Hunter DPS Analyzer