Hold Metal Windows vs. New Vynal in a ReHab?

[Jon Elson]

I am rehabbing a house built in 1959. Margins are tight. The house has old metal windows that close left to right (vs. standard up and down). The house probably has a dozen windows like this as well as a massive picture window in the living room. If the wood floors, bathrooms, kitchen, and hardware are redone, will leaving the windows decrease the value immensely? Is there a way to clean up the windows so they look nice? They function fine. Any ideas and opinions would be great!

[Jon Elson]

First off, I'm a little embarrassed for spelling "vinyl" wrong.  Is there a way to edit my older posts so that I can eliminate these spelling errors?

This is a flip.  I'm new to the flipping game, and starting by flipping my own personal residence.  Houses in this area sell for anywhere between 200 - 300K.

I read a great post @ http://www.biggerpockets.com/forums/67/topics/84596-change-windows where they discussued this exact issue.  I think at the end of the day, I'm going to have to purchase new windows.