pacer! because 750 is too much.
spend 450 and think of all that extra dough you can spend on dumb shit.
the pacer wont go as fast as the maxi or as easily as the maxi, but it looks "cool" and its a better deal.
I actually think maxis look better too, but that's a less common opinion, and as such, pacer'd probably be easier to resell if you wanna build something new
check the wiki on this site, theres a big writeup on performance in general. a typical order of operations might be:
ignition, better kit, lightened shit, clutches, better carb and intake, better pipe, suspension and brake upgrades, custom wheels and seat and tank and lights. paints, all the works
sell and start on something new.
of course you can always skip to kit pipe n carb party pack on treatland.tv - pretty easy setup for the maxi anyway.
the morini is less straightforward and not pre-packaged but you can get the same sorts of parts (w/ many fewer options)