would it be easier to buy just the engine (and related parts) or a whole front clip?

the b series swap into a del sol isn't a big deal at all. most complete swaps come with everything you need.

where is a good place to get the b18 (usdm or jdm...dosent really matter)?

www.sohfast.com wwwjdmhondaparts.com www.hmotorsonline.com our for sale forums, ebay, www.thepartstrader.com (kinda shady)

to keep the wiring simple...is there any pre made wiring harnesses out there for this type of swap?

a complete swap should come with the engine harnass. a complete swap should include the following: motor, and trans, shift linkage, axles with intermediate shaft, wiring harnass, all mounts (5 in total), and the computer from which the car it was pulled from.

anything else i should know before we start ordering parts (any swap pages out there?)

http://hybrid.honda-perf.org

were going to find the cheapest sol we can, so most likely it will have a d series engine.
most del sols have d series motors, only the vtec del sol had the b series