Giant Escape 1 Disc is Giant version of the Sirrus Disc you are looking at. It's $650 USD, and slightly better equipped in terms of component level than the Sirrus:

https://www.giant-bicycles.com/us/escape-1-disc



If you lived in Canada I'd recommend the Giant Rapid, it's similar configuration, but a much nicer bike all around with a slightly more robust frame, but unfortunately for you 'Muricans it's only available to us Canucks.

Personally I like Giant quite a bit better than Specialized or Trek, primarily based on value. They are all great brands (Giant actually manufactures Trek's frames for them), but I find that in most cases the Giant bikes are either better equipped at the same price point, or are lower priced if the component levels are exactly the same.

Cheers
TRJB