I would personally stick with spin and to anwer your questions.

In my opinion if you are picking one over the other then it's spin. Just easier.

yeh i lke what muppet said,  maybe best to stick to what you are happy with,when i 1st started i had a spin and a over head reel i prefered overhead, that was off the rocks casting but im back on the eggbeaters again not really by choice my bro inlaw lost my reel overboard idiot! so i dont lend what gear i have out anymore haha, goodluck  an enjoy ya synit rod

ummm...the question that really needs to be asked (Boulder taught me this one) is why not have both and multiples of?.....Tiger doesn't only have the one club in his trundler afterall.....although I do find myself using OH setups more regularly these days which is most likely because of the depth of water I tend to fish mostly (40+) and the ability to more easily stay in touch with the business end on the drop but even in the shallows say around Rangi in (15-) where casting forward then rumbling the bait along the bottom it's just so much easier to pause and let line out by thumbing the spool or engaging/disengaging the baitcaster mechanism IN MY OPINION!

Yeah, Kezza's final sentence does sum it up.

I will ask the question.....can you afford a synit combo and another combo dude?

Shet dude you can afford two synit combo's You wanted a yak eh too did ya get one?

as far as a 4 - 6kg OH reel....this is the bad boy you're after

ahhhh....yip!....the 10A and 12A are the Rolls Royce of softbaiting OH gear IN MY OPINION! and your budget certainly allows for one.....

  Personally having used spin setups most of my life I would always go spin. I've tried OH and just don't get the same satisfaction and FUN while using them. They are very effective though, but if you are like me and are used to spin setups then you might be disappointed with a "quiet" but effective winch. Also why do all the soft bait "pros" use spin setups most of the time. If you can, have a trial of both before you commit.