Hi,
Definitely recommend a lightweight stroller. Mclarens' range is good. Even better if you can afford it, look at the Aprica range (one hand fold) at Robinsons.
A lot of mums I know, including myself, buy the travel system and it's good for maybe 3 mths. Then after, they tolerate the use of it for another 3 more months (maybe less) and decide it's time to buy a lightweight stroller (most go for McClarens or Chicco) and use the Baby Bjorn sling when riding in a taxi.
AND maximise the use of your sling as baby gets heavier sooner than you realise...by which time, your neck, back or shoulders will be hurting!
Save your money and maybe when baby is older nearer 9mths old, you can buy a type of car seat that converts into a "stroller" costing abt S$300 and use it in the taxis or airplanes. So far, only e-babyasia at Forum sells it.
Not too sure the maximum weight it can take, but it shld last for a good 2 or 3 years, unlike the travel system.
At 9mths, they are a little too heavy to be in a baby sling in a taxi. I find that their feet get in the way, when I'm seated.
So good luck, and hopefully you don't end up like us with so many strollers!