The gasoline Spin is around the same as the Avanza. Automatic only, though.
If you want a manual Spin, you're looking at getting the diesel... the base diesel model is just under 800k.
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If you're getting the vehicle for business, the 1.3 Avanza makes more sense. Cheaper. More economical in the city with a light load (with a heavy load, not so great, but still acceptable) and there's more interior space than the Spin, and the loading lip of the trunk is lower.
Nowhere near as nice as the Spin, but if all you want is room...
If, however, the car needs to serve nicely as your personal car, the diesel Spin sounds enticing. I just haven't seen the LS model yet. The LTZ diesel is nice, but it's already a whopping 900k+
For work/personal vans, you can also look at the Adventure and Crosswind. The Adventure starts at just over 700k. The Crosswind at just under 800k. Both much bigger, more space... fuel economy is decent with the MT and maintenance is dead simple. Only problem is these two models are really popular with the anti-smoke belching units. A minus if you have to drive through Makati.
The APV is also an interesting choice. APV II starts at the mid-700s. The APV I is
still on sale and is available for under 600k pesos. Worth checking out. Fuel economy is not great, not with a 1.6 liter engine, but the cabin is flexible and legroom is pretty good. Only issue is it's very narrow compared to the other trucks here.
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In the end, while the Spin would make the nicest personal car of this bunch... I think the Avanza works best in the situations you describe. It's a very good in-city transport for six people (seven if the guys in the second row are not too wide...

) and it has a very flexible cargo compartment. Best bet is the 1.3E MT for maximum economy and convenience. Seven seats, power windows, no-nonsense black interior (easier to clean than the beige on the 1.5G) and it's the lightest and nimblest of all the seven seaters... perfect for zipping through traffic.