Looks like a pretty good system to me! I think you'll be much happier with it than the Dell.
I recently got a new system as well.....but I do a lot of very large spreadsheets and gaming. I couldn't find anything that fit what I wanted so I just shopped the parts and built it myself. It cost a bit more than I wanted to spend.....but I have never had a setup this good in my whole life.
Enjoy the new setup......you'll end up wondering why you didn't do it sooner when you see what a new computer can do!