As someone who has owned both brands, my advice is demo.
- Yes I am a Paradigm owner now, but I was happy with my T1s when I had them
- ShadyJ is legit reviewer so I respect his recommendation
- The 600c is a better center channel than the Supercenter XL
If you are comparing the 800F compare it against the T5s. You should be able to find GE & Paradigm dealers in the US because they are all over the place. I like the AMT tweeters on the GEs.
At the end of the day you have to live with them, so head the advice here, and demo to see what you like best.
I have solid dealers I work with for both the Digms and GEs if you need help, so DO NOT pay retail no matter which you buy.
I am not a fan that fact that Sandy Gross left GE and that they were bought out by Audioquest. That being said, they still have excellent customer service. If you go GE, I would strongly suggest getting the Superstat 50s at least for the surrounds.
Do NOT get the Forcefield Subwoofers from GE, they are junk, I own the 4 and it is not being used.