Usually the front will require little to no adjustment. We did an alignment on our shop 370Z after a coilover install and the front alignment specs were spot on. The rears were just within the factory adjustment range. It could vary from vehicle to vehicle though.
For pricing, most of the basic coilovers are within the $1000-$1400 range. BC BR, Stance GR+, and KW V1 fall in this range. I would definitely suggest taking a look at either the Stance GR+ or KW V1.
Upwards of $1500 to $2000, you can get HKS Hipermax III, KW V3, Tein Super Street/Flex.
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