Product page dropdown box for variant SKU's

Instead of having a product page listing every sku is there a way to change it to a drop down box?

1 product dropbox then there might be the 5 or so different variant SKU's in there to select from.

Its a pain have a page with lots of the same but very small changes size color etc.

I can do it with attributes instead but then stock quantities would not work correctly.

Found a sample here of what I want to achieve

http://www.locksgalore.com.au/?page=shop/flypage&product_id=1&category=locks_deadlocks_deadlatches_deadlocks