My advice is try the free versions first and see what you like.
If you post exactly what you are looking for -- what features, what type of information? -- you may get better recommendations.
For me, I get by with Poynt, and email alerts (NOAA, National Hurricane Center). I've tried some weather apps, including browser push services, and eventually deleted them. But that's me.
Are you looking for anything in particular? Posted via BlackBerryForums.com Mobile
I've used both BBweather and BerryWeather, and I'm now using BerryWeather. This one is definitely worth paying for, and if you keep a weather eye on the horizon you can find deals on it.