With my first, I insisted I wouldn't need a stroller and would baby carry (sling/wrap/bjorn) all the time. My mother insisted and we ended up with a Perego Aria - 13 lbs and a full recline. The lightest I could find locally with a full recline (similar reasons for wanting that as to OP).
I'm now working on #3, and have had some changes in my parenting. I firmly believe that the baby does better in a carrier of some kind. I'm currently searching for something good for a newborn, b/c I hate my sling. But highly recommend an ergo/beco type thing for when they are larger. That said, with multiple children, I think a stroller is essential. My oldest is actually the worse about strollers - he'll insist that he'll walk, so I'll bring a single, then he'll insist on being allowed to ride once he's tired. grr....
Ok - onto strollers. If I were to do it again, with one child, I'd suck it up and buy a full stroller with bassinet feature. Something like a chameleon. I'm actually thinking of getting one anyway for this baby. At the very least, for my last friend who had a baby, I recommended a Quinny Buzz or Perego P3. Depends really on what you plan to use it for, and if a bassinet feature is important to you. I tend to only use the single stroller when the baby is sleeping and I want a hot,sticky baby off my chest. Otherwise, I'm carrying them.
As for lightweight strollers, all the macs have good reviews, some more so than others, but I wouldn't steer you away from them, just be aware that many do not recline. I have a Quinny Zapp and love it - but be aware it does not recline either. I like the microlight fastfold - but can't fathom spending that much for a basic umbrella!
Personally, my kids spend most of their time in my BOB (I have a duallie, but you can get singles). The recline is decent, the steering is incredible and the suspension is bouncy enough that I'd put a really young babe in it. Keep in mind I'm talking walking here - not jogging.
However, it is heavy, the fold is 2 handed and you need a larger car to fit it in.
What I think you need to do (especially since she WANTS to buy you one) is figure out how you plan to use it and get the best made one you can afford. Are you strictly a trunk to mall person? Or will it see a lot of festivals and broken sidewalks? This will determine if you need better suspension and wheels. Is a large basket important to you b/c you'll be doing walking/shopping? Does the push need to be good b/c you'll have something in your other hand (another child, a dog on a leash or just a latte?) - if so you need to factor that in and get the best 'push' stroller you can afford.
If you really want to get into the obsessive nature of researching this, check out the yahoo group strollerswap. These ladies talk about strollers ALL.DAY.LONG. You can get a ton of info by searching their archives. Good luck!