Quoted from SantaEatsCheese:

I was quoted $5700 delivered to my door by a respected distributor... so $5300 seems like a pretty good price to me.
When I had my want ad up I had an offer for a used one 6 or so hours from you for 5450 with:
Aurich art
Mirror balls
Pinbits protestors
Pinbits pop dress up
Mezel mod insignias cover
Real work rails
All premium non ghosting CT LEDs in GI and inserts
Vengeance mod
Enterprise mod
Klingon bird of prey hooked to GI
Erak asteroids
Mylar flipper protectors
Complete white superbands
Blue superbands flipper rubber
One of a kind warp chaser that works with warp hits
Shaker with pwm controller
Blue leg protestor cliffys
Spring cover mod
And more I can't think off the top of my head
Vengeance mod
I personally am picking one up from a friend for $3500 this weekend... however, that price is lower than any price I've heard for a Star Trek Pro on pinside and I fully realize he's hooking me up.
The going rate for used stock pro seems to be around $4200.
I personally would rather have a loaded and modded out used pro or used stock premium than a NIB pin if you are talking similar price points. With that said I've never had a NIB pin.
My advice for you would be to wait for the used pin to pop up near you. However, as stated earlier $5300 for a NIB pin is a great price.