We love the Aria stroller, it is really light, folds pretty flat and has good storage space. I think you should be able to get an attachment that allows you to put your bucket-carseat on it so you can keep the baby in the seat when you get in-and-out of the car.
if not however, you can hold off on the aria and just get the bucket seat you want, and get a snap-and-go stroller frame -- they are just $40 new or there are probably several floating around craigslist or even on mamasource.
for a newborn, being able to keep him/her in the seat if they are asleep (but still be able to load/unload) is huge. and you will not need the full stroller until they outgrow the bucket seat anyway. so if the aria can serve this purpose in the interim, all the better.
hope that helps and good luck!