The mouse should function normally without any drivers, but you won't be able to use any special functions.
However, you can download drivers from the official website - http://redragonusa.com/downloads
I would start with upgrading to an SSD since that boost will be the most noticeable. Use the laptop for awhile and see if 4GB of RAM starts limiting you.
These laptops don't quite exist yet. And when they do they're going to be crazy expensive.
How much are you willing to spend exactly? "Best priced" means very little.
This STARTS at $2500 -...