Garmin 310XT replacement

I have a Garmin 310XT that's about 5 years old and I think nearing the end of its useful life.
I use it primarily for bike riding, with some running, walking and hiking. (My knees are starting to go, so I may be near the end of my "beginner triathlete" days... I also separately have a Garmin Swim.

Does anyone have a recommendation for a replacement? I've heard mixed things about the 910, which I understand combines the biking/running tracking with the ability to count swim laps. I'd consider an all-in-one device, but it's really the biking/running/walking function that's more critical to me now. I'd like to stay with Garmin since I have all of my data on the Garmin site.

Thanks in advance.