I have two Nikon ProStaffs 4-12x40mm's and just bought a Monarch 5-20x44mm BDC.
I am ABSOLUTELY SOLD on Nikon, and will probably be a customer for life.
And I did NOT buy it because it was all I could afford, I wound up liking the Monarch @ $530 *BETTER* Than the $1000 Leupold I looked at, and at half the price, it was a no brainer.
Nikon has ProStaff as the entry level, Buckmasters is a nice big step up in quality, Monarch is their top of the line flaghships scopes.
Buckmasters are great price. Just so you know, they just 're-released' a Monarch 3-9x40mm "UCC" (Ultra ClearCoat) "original Nikon Monarch" for like $179 - maybe the best scope for the money you could possibly buy.