How much should I rent 1/2 of a duplex for? (Poll - please contribute)

[Joseph Macken]

Hi BP Community! 
I'm kind of a newbie here, and had a quick question regarding how to price duplex units. 
Here's the relevant info: 
- It's a top bottom duplex, with very similar ±1200 sq ft floor plans, in an older neighborhood of SFHs and small (2-4) multi-unit buildings.
- The lower unit is a 2/1
- The top unit is about 5% bigger, and has an extra bedroom making it a 3/1.

The lower unit is rented for $1,000.
So the question is, how much would you rent the top unit for?