For a great "off-the-shelf" package system, you might want to check the Alienware
offers. But other sources (especially computer service shops) would be a great source to getting what you want. With a "package" system, you typically get a lot of unwanted software pre-loaded. But when you do it yourself, or have it made for you, you get a better deal.. although at maybe a bit higher price. Those "packages" typically help lower the purchase price, in hopes you will buy the software.
Get expert advice from a pro.. not from a mega-store salesperson looking for a commission. You could also check the displays at a "shopper's club" such as Costco, BJs, or other.
But if you are able to work with www.newegg.com/
, check for their 'package' deals and 'bare bones' kits.. as well as 'open box' specials!
F@H.. to solve mankind's maladies.. in our lifetimes!