Road bike recommendations

Where would people be putting £1500 at the moment.

It's for long fastish training rides, needs to be shimano compatible.

Any advance on the Planet X rt 58 ultegra?

Or should I stick with my beaten up ribble and get a power meter...?

FWIW I had an RT58 for a couple of months which I loved (till I broke it in half crashing into a plant pot). I'm just waiting for the insurance and will be getting another frame/fork.

Pretty light, so climbs well. Incredibly confidence-inspiring on descents - took things way faster than I thought I would in the Alps. The wheels on offer now are better than I got.
It's pretty 'dad fit', rather than outright race, but not as sit up and beg as some sportive frames.