What springs should I get? Help!

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I've got about $170 to spend for my spring upgrade the list of springs I'm considering is:

Tanabe DF210 lowering springs - $158.00

Tanabe NF210 lowering springs - $168.00

Progress Lowering Springs ------ $144.95

Megan Racing Springs ----------- $132.00

I don't like to rush things, and probably am not going to be able to do any further major upgrades for a while, so I'm quite worried about which ones to buy. I also want larger wheels someday. I think the DF210s are the largest drop, but I wonder about pot holes and speed bumps. A larger drop might not allow me to get larger wheels later. The Tanabe site seems to mention that they are more for lowering then performance. The NF210s have a larger wheel gap and are made for comfort. I'm not sure how much I like that. My wallet likes the Progress and the Megan springs, but They don't seem as popular as the Tanabe springs. But I think the price difference might help make up for the alignment I'll have to get a couple weeks after the install... basically I'm a total car noob and want to be sure before spending my money