Options module that handles stock etc

Hi all!

I am looking for a module which handle stock on OC2.
What it needs to do is;
- Subtract stock based on purchased option
- Allow for options not in stock to be purchased
- Update stock status and price on product page based on chosen option

The first 2 are done already by opencart
The live update is in my Uber options - Price Tools mod
http://www.opencart.com/index.php?route ... n_id=23647