if u want reliable old car with a lot of option for its parts, japanese car most likely.. but not all, certain only..
honda EK or EG kinda good choice, its powerful enough n there's a lot of performance part for it
for toyota i'm not sure, but general idea is toyota has better price (means lower price) compare honda, honda EK n EG parts kinda a bit at expensive side, but then toyota performance not as good as honda.. n performance parts kinda hard to get compare with EK n EG which there's a lot for those.. but toyota cheaper to maintain..

why not u just mod ur neo engine, mod ur current engine.. campro engine kinda strong if the mod n tuning is right.. heard for drag in their category (not sure which one) get 1st place but that was last time (not sure when, could be last year or b4 that)

but with 2 cars u need to maintain izzit it a bit difficult? can u afford to maintain 2 cars at one time? if me i prefer have 1 car that can do almost any daily driving, some trackdays, 'balik kampung' drive, can carry a lot of thing (means sedan car), and weekend driving..

erkk seriously saga 1.6 powerful? maybe average i can consider, but powerful maybe not.. 0-100km/h in 8s is consider powerful enough for malaysian road, not joking here, with that kinda of acceleration u can follow most new car n luxury car with no sweat..

if u put like that maybe.. but TS here prefer more powerful car which cheap to maintain, saga 1.6 is a new car.. n its performance not that , summore with CVT gbx (which its not advisable to high rev it alwz) n also new car parts not cheap eventho its proton..

hermm.. depends on which car, not all old car parts are expensive.. if model like EK n EG sure a lot more.. i think as long as half-cut shop is available, most old car parts can buy from there..