*bogeyman: Higante horizontally not vertically ;)

I have a few questions. I won't be making a new thread to avoid clutter...

Well sa pagiisip ko kahapon at kanina. I realize na I'm subconsciously or consciously picking sedans that are above 1.5L. So my price are way higher. Nagustuhan ko din ung Fiesta at City.

Say 2-3times a week, may carga ang kotse mo na ~500kgs (tao po lahat, assuming 4 125kg people.). I'm 125kgs. How big of an engine do I need or car for that matter? For City driving as well as for climbing like tagaytay highlands. Kung iiba ang requirement paseparate please. I want to see my options.
1.) How would a 1.3/1.4 L engine like the Vios or Accent/Fiesta fare?
2.) How about 1.5L like the City?
3.) How about the 1.6L Altis or 1.8L na Focus?
4.) if you were me and may cargo ka na 500kgs 2-3 times a week anong klaseng kotse ang pipiliin mo?
5.) What do you think is the absolute minimum I need if 500kgs ang dadalhin ko? Recommended? Absolute Maxmimum na anything above is pure excess?

Most of my friends kc have 1.8L and above, so I'm sure kaya ng 1.8L and above, pero below that not sure.

Last is, while thinking of 2nd-hand while in MRT nakita ko ung mga 2nd hand cars sa Cats motors. And I remember na there is such a thing as "Certified pre-owned" sa US. Not the ones na nakikita ko sa sulit that they just slap the phrase. I'm thinking more of the kind na the manufacturer does a thorough inspection and certifies that the car is in top shape and slap a year or so of warranty in it. That will give me the peace of mind that I'm getting a solid 2nd hand and not from a random dealer. So far nakita ko palang is sa Toyota at Toyota Motor Philippines introduces pre-owned program - News | TopGear.com.ph and european cars (That I don't plan on getting).

Anyone know of other brands that does this sa pinas?

Thanks.

Sorry for the many edits. I found the answer to #1. http://auto.howstuffworks.com/auto-p...e/payload1.htm looks like that significantly narrows my choices...