XPS 15 - Best setup approach

Getting the XPS 15 laptop and I was wondering if it is best to reinstall the OS or just go with the basic Dell load with the trialware?  I would like to ensure my machine doesn't have unnecessary "bloatware" but I also don't want to have to go through the hassle of putting on the OS and drivers if the base load isn't problematic?  

I tried to get the sales rep to give me a clean machine like the Signature Edition of the laptop from Microsoft but they said it wasn't possible.  They said just to remove the apps if I wanted.  

Thoughts? 
Mark