Surely even the best brakes and tyres - even if they stop the bike in record speed - don't stop /you/ and you end up flying over the handlebars or doing a front-wheelie?
Quite happy with a pair of V-brakes as long as I apply them earlier and harder when it's wet!
I cycle on a fairly standard Claude Butler hybrid thing, pretty heavy as it's only some kind of alu alloy (feels like 99% lead sometimes when I pick it up while knackered), but with fairly knobbly tyres on my wheels (big diameter wheels, 700c or something?). Would it be any easier on my ride to get thinner or slicker tyres, or should I stick with what I've got given that a fair bit of the road is poor quality on my way to and from work?