I don't think any of Acer budget laptops can have docking station (real one). Check whether you have ExpressCard slot on your laptop (similar to one where you put SD flash memory, but wider and deeper). In that case, you might look around for external ExpressCard-based wideocard.
Or, better yet - get a new laptop. You can get GeForce 540M-based laptop for less than $700 these days.