I would probably just get some nice Sugino chainrings myself if I needed to replace them. However I would probably go for a new chain and cassette first and if I was having issues make sure everything was properly tuned up. Only if teeth were bent or there was a huge issue with shifting proven to be caused by the chainrings would I change the chainrings. And I probably wouldn't change cranks unless they were cracked or stripped or I was saving a significant amount of weight and keeping durability.

Head down to your local shop and talk to the mechanic (or if you have a head mechanic talk to them) and see what they say about your chainrings. It is hard for us to diagnose without seeing them.

If you were just going to replace the whole shebang even though it would be a silly move, I would go with the Sugino Alpina 2 Triple which is a 48-36-24. I wanted a little lower granny but I still liked my middle ring a lot and the outer ring is fine, though I don't use it a whole ton while touring. Granted this went on a brand spanking new frame and wasn't a replacement just something I wanted to upgrade when I moved from the Disc Trucker to the Co-Motion. My new cassette is a 11-34 in case you are wondering as I wanted a touch lower for the hills.