Interesting that this same question has popped up so many time in just recent couple of months compared to the years prior.
To answer the question, you really need to be able to state your driving goal - the prime objective of driveability and then secondly, how much you can afford to spend.
Lowering springs and/or drop spindles are the cheapest way to go but history tells us that there is no single great answer to ordering proper springs. Peoples' experiences with various spring retailers is all over the place. (myself included) Also, this method is a pain in the arse to adjust if you don't like what you end up with. (remove, cut, re-install) PITA
Up the chart in Price is the air-bags. There's various companies offering stuff now, and you can go all the way with cool features and spend up to $4k or more if you like. I think the dirt-cheap end can be done in the $1k-$1.5k range. (off-brand, no extra's)
It's also a nice middle-of-the-road since you can adjust the ride height to where you want it, and slam it down at cruise-ins and parking lots.
Then there's the higher end and arguably the best performance overall with coil-overs. Lots of players in this game too. Nice that it's pretty easy to adjust the ride-height, even the springs if you like and the performance will be great. It's just 'spensive. Gotta have your Players card.
I have too many different things vying for my $$$ so I cheaped out and went with cut springs on my Imp. (coil-overs on my other toy)