Are there some general rules of thumb for the various types of rods one should use for various applicatioins?

What kind of rod (medium, medium/heavy, etc.) and how long would one use as a "general" rule of thumb for plastic worms, crank baits, spinner baits, jigs, etc.

I got to wondering about this after seeing the thread on top water rods.

I only have a few rods right now and as I look to expand in the future, I'm trying to get an idea of what I should be aiming for when I make my next purchase.

I realize I may get several different answers here, but any input would be greatly appreciated, just the same.

My arsenal pretty much goes as follows:

Plastics(Texas Rig) and jigs- 6.5' casting rod, med-heavy action, light weight graphite blank(G.Loomis IMX, GLX or Phenix PX-1)

Drop Shot- 6.5' casting rod, medium action, light weight graphite blank

Spinnerbaits, buzzbaits, large topwater(Super Spooks, Prop baits)- 6.5 - 7' casting rod, med-heavy action, medium weight graphite blank(G.Loomis GL3)

Small topwater(Ricos, Poppers), soft jerkbaits, hard jerkbaits, Senko - 6.5 - 7' casting rod, medium action, medium weight graphite blank

Crankbaits- 7' casting rod, glass or composite graphite/glass

Vertical Drop shot(fishing off your fish finder) 6' spinning rod, medium action, light weight graphite blank

Remember, you don't have to break the bank with every rod you buy. Most of my non-feel presentations(reaction baits) are with rods that aren't necessarily the lightest, most expensive on the market.

That's super feedback and I appreciate it very much. I'd certainly like to hear what other have to say as well.

I'm slowly developing my arsenal of equipment and all the feedback I get here has proven to be invaluable.

cj has got it covered as usual. the only thing i might add is that you can find a rod that can serve several purposes. for example
i've got a loomis mbr783 6'6"( which chris turned me on to, thanks man), that is a great all purpose rod. i throw jigs, blades, texas rigs, topwtr. When you throw things that deviate from the norm in either direction( Over sized blades, swimbaits to tiny light cranks)
this is where the specialization comes in. good luck on the water, T