Hoo boy... thinking about going wide wheels huh? That's a whole nother can o worms.

(sweet finally an excuse to use this one!)
The quick answer is ideally a 235/45/17 or a 245/40/17 but, with that size tire you may run into some other issues and that is really like a track car tire size. Not too great for a DD and especially an LX with limited power as it is. I know cause I have one also.
My wifes car has 18x8.75 +35 wheels on it. I made her run a 225 width. It was the narrowest tire I feel comfortable putting on a 9" wheel. Some guys run a really small super stretched 205 width. It really depends on some other factors and what you feel safe with.
I can try and help you but give me some more info first:
What's your goals for the car?
Are you wanting to go really low?
What sort of drop are you considering?
Do you want the wheels really flush with the fenders?
Do you like the really cambered out look?
How much rubbing is acceptable to you?
Are you willing to do fender work? (rolling/shaving, heavy modifications)
Do you like the meaty tire look or do you want the stretched tire look?
There is a lot to consider when going to a wide wheel and a low offset. Are you pretty familiar with tire and wheel sizing? Also consider that maintaining a proper wheel circumference, keeping it close to stock, means that your spare tire will fit if you ever need it. I'd hate to see someone on 22's try and fit a stock spare and drive safely.