As Gordon said, there are advantages to standard and dropped spindles. Dropped spindles lower the front 2 1/2" (which is probably close to what you'll be after; still put the adjusters on the beam, though, so you can fine tune it), you still have stock suspension travel, use stock length front shocks, haven't added any more bump steer (the angles of the tie rods haven't changed), and will only have to shim the bottom beam the minimum amount to achieve the added caster (very important if you do a lot of highway driving!). They do add a little width to the front track (1/2-5/8" a side for most sets; you'll have to ask who you buy them from the exact amount), and there are some 15" wheels (aluminum- I know some people have had troubles with getting Rivieras to fit) that don't clear the caliper without a little work, but it can be done. The bottom trailing arms can be machined so the ball joint sits just a little deeper (a pain in the *ss to find someone to do it, I know). Most rims you'll be looking at (6" width max) will probably have enough backspacing that outer fender clearance won't be a problem (unless you drop the thing wickedly low!).
Lowering the front end with stock spindles and beam adjusters- you don't have to worry about any added width, wheel or caliper clearance issues. You'll have to shim the bottom beam further forward for enough caster so the car is safe at higher speeds, though, and you'll have to monkey around with the tie rods (I think guys mount the outboard ends upside down- the spindles will have to be re-machined for this) to minimize the extra bump steer. I don't think you can get the tie rod angles all the way back to where they should be, but it will be an improvement. If you lower the car much more than 2 or 2 1/2" you'll be looking for shorter shocks. They're out there, but (as I understand it) some are not valved for such a light front end, as they're re-purposed from something else, so combined with the reduced suspension travel, the car can end up riding quite rough.
I think I covered everything. Hope this helps. Al