I'm in the market for a new set of tyres for my commuter/general runaround bike. It came with 700x32c tyres with an inverted tread. For a while I had an almost slick 23c tyre on the back which, while fast, was rather harsh on the local towpath. I've got a hankering for a new set and have a few needs/wants:

• Fully slick tread pattern. On the road, a tread pattern only serves to reduce traction so I'd like something entirely bald. I'd be doing light off-roading (think beaten-up paths) but I think the increase in on-road traction is worth the trade-off. I'm not convinced about how effective an inverted tread pattern is on this type of surface anyway.
• 28mm width. This seems like a reasonable middle-ground between speed on-road and comfort off it. 23c was too rough, and I'd be worried about flats on rough ground.
• Reasonable puncture-resistance. It doesn't need to be laiden with every other kind of protection but something that can survive the rigours of road debris and stones, twigs etc.

Something like the Freedom Thickslick Sport (28c) seems perfect except they're darn heavy - 467g each. Despite that they seem like good tyres and might end up going for them. A tyre similar to the Thickslick but a little lighter would be ideal. Does anyone know of my "perfect" tyre? Thanks!