You're kinda playing tug-of-war against yourself here, on one side you have lowering the car and on the other end you have wide wheels/tires. Can't always have both unless you're willing to do some major work like notching the frame. If you want the car lowered, don't plan on having big tires/wheels and vice versa.
Sure, it CAN be done, but it'll take a lot of trial an error to make sure everything fits and doesn't rub. If you want the "tucked in" look on a lowered car, you simply can't have a very wide wheel.
I went through the same thing, one week I wanted to lower my car, the next week I wanted to start running drag radials. As you can tell by the picture of my car below, I ditched the plans to lower it and just went with some huge tires.
If you're a patient person, go ahead and try it. It's just hard for any of us to really answer your question about what will fit and what won't. Even if you took 3 or 4 completely stock Buicks, once you take into account some cars are missing body bushings, some cars aren't centered on their frames, some cars have sagging suspension, you can't even guarantee that the same wheel/tire combo will fit on 2 identical cars. Once you throw in lowering springs it's even harder to really say for sure what will fit.
Edit: The one idea I did come up with is to lower the car first with the stock rims on the car (if you still have them) that way you can see how much the lowering springs affects your clearance and you can take some measurements to see how much bigger of a wheel you could fit. That's really the only way to be sure, taking exact measurements off of the exact car that the wheels are going on.
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