Hi J.,
I am not sure if you would like any other attachments (cross-country skiing, biking, etc), but we have a Chariot and LOVE it! It is the only biking stroller we found that you could have an infant in (not to bike yet, but at least we didn't have to buy two biking/jogging strollers) The things I like about it
1.the front wheels are under the stroller m(so it is more compact feeling) and turn (I didn't like the one stationary wheel in front, but I am not a hard-core runner)
2. the rain cover is awesome...we lived in Vancouver for a year and my son was toasty warm and dry during 2 hour walks...I was sopping wet, but...
The cover is also great for walking in the cold.
3. there is plenty of storage space for running errands or carrying toys to the beach, etc.
4. my 3 year old is very comfortable in it and now my 6 month old daughter likes being in it too (she is in the sling attachment)
5. it fits through all "normal" doors if you take it shopping
We really really just like our stroller!
Things that I would maybe like in a different stroller.
1. I think my kids would like to be separated at times (vs. on the bench seat they are on). Some bigger just jogging stollers (like BOB) have pretty much two separate seats each with their own sun shade and they recline separately (but we have not seen that in a biking/jogging one).
2. a self cleaning stroller...ours is pretty gunked up from the kids being in it so often ;)
Hope that helps a bit even if you are not looking for a bike combo maybe some of my likes/dislikes will give you some things to look into.
Good luck!