New Bike choice. Confused by Carbon Frames

I am looking at a new bike with a budget of ~£1200. I was hoping to upgrade my Specialized Allez to a carbon option. I will be using it for Sportives and the Etape this year.
Once bought I am unlikely to ever go out and upgrade the components further.
Most discussions regarding groupsets seem to be from (Shimano) 105 to Ultegra you really can't tell much difference so therefore that suggests the frame would be the key difference.
A Spec Roubaix seems a good option but then there is a different level of Carbon for every model and with my budget I am at the bottom. 6r or 7r.
The Trek Madone 4.7 2008 has some good sale prices but this is the TCT carbon as opposed to the OCLV on the bikes higher up the range.
Finally Planet X always get good write ups on here but is that just because of the groupsets that are included at a comparitively low price?
I am totally confused which is the best way to go. I could probably test ride them all and notice a difference from what I have now. Are they all like for like or does one stand out?
Once bought I am unlikely to ever go out and upgrade the components further.
Most discussions regarding groupsets seem to be from (Shimano) 105 to Ultegra you really can't tell much difference so therefore that suggests the frame would be the key difference.
A Spec Roubaix seems a good option but then there is a different level of Carbon for every model and with my budget I am at the bottom. 6r or 7r.
The Trek Madone 4.7 2008 has some good sale prices but this is the TCT carbon as opposed to the OCLV on the bikes higher up the range.
Finally Planet X always get good write ups on here but is that just because of the groupsets that are included at a comparitively low price?
I am totally confused which is the best way to go. I could probably test ride them all and notice a difference from what I have now. Are they all like for like or does one stand out?
Tri Coaching
https://www.h3otriathlon.com
https://www.h3otriathlon.com
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