Choose your speakers first, then an amp that can drive them.
Driving too much power to the speakers will damage them, but having an amp that is underpowered will also damage the speakers: if you drive the amp to clipping the speakers get a very unnatural signal that they can't cope with - in fact that's what may have blown your previous system's tweeters. The rule is to have an amplifier power rating about twice the speaker rating. This works because the amplifier's power rating relates to the peak levels (absolute ceiling above which it won't go), while a speaker rating is thermal and is therefore more related to average power, and in real music (as opposed to higly compressed recorded music) peaks are well above average levels.

The Yamaha StagePAS 500 might suit you - amazingly lightweight, and the speakers and amp are bought as a matched package.

A good alternative route to a small simple system is powered speakers. They are often no heavier than a passive speaker of similar power.

For our ceilidh band we use EV SX300s with and amp that can deliver 450Wpc.
For monitors we use JBL control 1's on mic stands and about 100W driving them. We are considering using the JBLs for small sound reinforcement jobs too - we once put a scratch band though them in a village hall party and they held up surprisingly well but they don't give you a lot of bass.

Before others ask in - how many inputs, what instruments and how much do you want to spend?

Anahata