Unless you need a spot meter, I'd recommend the Sekonic 358. If you need a spot meter I'd recommend the Sekonic 758DR (or the 558R if you can still find it). You can get a spot attachment for the 358, but by the time you equip the 358 with the features of the 558/758 you'll spend the same money and the spot meter on the 558/758 is 4 stops more sensitive to light. They are weatherproof and solidly constructed, very much more so than the 308 or 328 (BTW - the 328 isn't manufactured anymore).
I've seen two Polaris meters in the last 3 years. One read under by 1/3 of a stop and the other read over by 1/3 of a stop. Both were fresh out of the box and metered the same scene. My statistical sampling of two units isn't particularly useful in establishing the accuracy of the brand in general, but a 2/3 stop variance between two units of the same model leads me to recommend other manufacturers.
I use a Sekonic 558R and have a 358 as a backup. They are accurate and rugged. I use them because they have PocketWizard transmitters in them, make scene evaluation easy, and measure multiple strobe pops (very useful in large format product and architectural photography). The 358 is about half the size and weight of the 558/758, which is nice when you need to travel light.
I have also used Gossen and Minolta meters. I found the Minoltas accurate but fragile and the Gossens accurate but overpriced.
People who do stupid things with dangerous substances often die! -me