For me i'd do as all have said and drive both. I've test drove a s2k and owned my zed for coming up 2 years. What i'd also look at is what type of roads you drive, my daily commute used to be twisty b roads all teh way pretty much, i had a MR2 and loved it and i have no doubt in the world that if i had a s2k i'd love it even more. Only reason i haven't had a s2k so far is insurance costs, they're silly compared to the zed for me.
No i did this same commute in the zed for a year, i also enjoyed it, but it wasn't as "fun" as the roof wasn't off and you couldn't thrash the crap out of the zed as it had a bit to much torque for the road (probs gunna get slated there).
However i then had a 40mile motorway cruise for my daily drive, zed was lovely, you can just put your foot down and wave goodbye to the normal drivers, if you need to get past it's no problem, easy. while in a s2k i could have been changing gear all the time (is that actually a bad thing though?)
It all depends what you like. If i'm honest i'd love a sk2 i love V-tec the sound is to me. I'd love the convertableness and the nimbleness. Would i want one over my zed, tbh i'm not sure, it's a very tough one. I'd miss the looks of the zed, the room, the boot, the easyness of driving, the reputation of it (daft i know), the power and i like the way it handles, it's a good handling car just not light and nimble.
If i had the choice and it was a year ago, i might have traded the zed in for a s2k as the amount i've spend repairing the zed i could have bought 3 years worth of insurance on the s2k, but then i imagine hondas will go wrong to. But then after all you've been through with the car i don't think i could trade my zed in for most things now.
So i'm on the fence, get what YOU want and like the most