Here are my thoughts.
You can get a SRAM cassette that goes up to a 28T cog without compromising the rear derailleur capacity for, max, $100, depending on where you buy it from.
My compact crankset retails for $350, though it's now available on closeout at some places for $200, and that's about the cheapest of any crankset at Ultegra level or higher (including FSA like mine, SRAM, Ritchey, etc.) that I've seen ON SALE anywhere so far.
A 28t cog in back would be roughly the same as having a 26 on the 53/39. That may not be enough. So then you have to decide if the extra investment in a crankset is worth it. The point everyone is making is that you cannot just swap out your rings. You will need a different crankset, because the spider will not be compatible. That means new rings, spider, and crankarms.
If you have a 25 in back now, I think that'll be plenty easy with a 50/34. My lowest gear is a 36/27, which is roughly the same as a 34/23. I think a 34/25 is a good steep climbing gear.
Now if you want to go back to a triple, that will be the most expensive, because you'd have to buy almost a total new group (new derailleurs, new crankset, new shifters).
New cassette is cheapest change, within your derailleur's capacity. Moving to a new crankset is the next best move (excelsports.com has some good sales if your shop wants to charge you a lot).
Have you looked to see what your cassette is on your new bike?



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