Stickbaits & minnows that tend to be lighter I'd go with the 7-35gram rod. Metals, poppers etc that are usually a bit heavier & I'd go with the 10-50gram rod. Really depends on your lure preference I guess. For one that will do the allround job I'd go with the 10-50gram as it has a wider range.

WOW that is a loaded question.

I assume we are talking about lures and unweighted bait.

For that I use a 12 foot rod, that can throw up to 3 ounces. (75 grams). with a windcast reel and 20 pound braid. I also have a 8lb 7 foot, 35 gram rod. but as soon as the wind picks up I don't have the weight to punch a lure over the breakers.  for those windy days when you need to get out far.

Most of my Lures go to 40 odd grams. But I have a couple of "heavies" (75-90 gram)

Guess it is going to depend on where you plan to fish and what weight you want to cast. a good 12 foot, 75 gram rod will still cast a 35 gram lure while a lighter rod will struggle with the heavier lures.

Cheers

 12ft is just too long, i'm after a 9ft and having it as on all rounder, so I guess the 10-50gram will be the one to get..

I have a 9ft Lemax president with a 5000 stradic & 20lb braid for that sort of work rated 12-40lb cast weight up to 100g ( never tried any thing over 60g myself) I think its a great combo. can cast 150m with a tail wind! Its got enough guts to stop big fish but is still sensitive enough to fish for whiting with.

 any suggestions on a reel? will a 4000 freams or caldia do the job

Both would do the job no worries but if you can afford it the Caldia would be the choice of the two. I'm a Shimano fan so my personal choice would be a Stradic 4000 or 5000 depending which felt better on the rod.