Hi Scott, I will be at Shoalwater the week before you. I should point out that there it is unlikely there will be any jigging options at Shoalwater. I think there are a few spots we've seen where you could drop a jig but realistically, you're really only likely to encounter big reefies and probably mongrel spaniards that wil steal your jigs.
Shoalwater really is a popping location. You should pack some light tackle though as it can be real good there.
In terms of your trip to New Cal, I think you can get by on PE6 without going out and spending a heap of more money. PE6 is 80lb anyway so you should be ok with this. Ideally, it would be nice to have a PE8 outfit but you're probably spending a heap already!
I don't know who recommended the Ripple 5220 to you but the person obviously doesn't like you! It's a beautiful rod but way beyond the capacity of most normal people. I'd look at a 5210 or a 5215. If you're really masochistic, check out the Zenaq Monster Buster B60-H. Duncan at Fishhead will happily sell it to you!
If you really want a PE8 option and am budget conscious, I'd suggest you look for a Shimano T-Curve 400. This is a PE8 rod and can be had for great prices if you shop around. The rod is very capable and is a bargain at the prices it can be had for.
Personally, I've never been able to work out whether I am better off with PE6 where I have more line or PE8 where I can exert a little more pressure on the fish with doggies. As I don't fish for them anymore, I suppose it's all rather academic. Without having any idea of your physique and strength, I can't suggest what rods may be suitable.
I am biased but if you want to spend more money, I'd personally suggest you buy another popping/stickbait rod as a spare. It is so easy for a rod to be put out of action during the week. Last week, I wiped one rod out of action and bent the guide over on another (which I was able to bend back) but I had plenty of spares.