Scott is right about $2500 and it doesnt matter whether its a week that converts to 350000 points (like some of the Hawaii weeks, or one that converts to 126000 points, like a studio in New Orleans.
There is another way to convert weeks to points and that is to do it in concert with a purchase from Wyndham. Last I checked the "rule" is one for one, ie with one small purchase from the developer (63000 points I was told) you can convert one week.
its also important to note that sometimes there is no choice, you have to do it with a purchase
If you would rather have points you might be better off selling your Avenue Plaza week (these routinely sell for a dollar if the seller prepays the next years mf and pays all closing costs. and transfer fees...So you can be out for about $1000 to $1500 and buy some points. on ebay ie probably get your 140000 points for another $1000, so pretty much a wash
From my experience, If you want to use the week or points in New Orleans, the floating weeks are a better option. But if you dont want New Orleans at all sell and purchase what you do want.