well, I've driven a box with a 3.6 and a box with a 3.2 and the 3.6 does have more power but uncertain if it has $10k more power.
your car is a 2003 which means it has a Bosch 7.8 computer in it. this gives you a lot of versatility and options as per this page:
http://www.pelicanparts.com/techarticles/Boxster_Tech/11-ENGINE-911_Engine_Swap/11-ENGINE-911_Engine_Swap.htm
this gets you a 3.4 cayman (no sense going to anything smaller) or a 3.6/3.8 911. the cayman engine is hard to price as there are not a lot out there. a quick trip to ebay doesn't show any:
http://www.ebay.com/sch/Complete-Engines-/33615/i.html?_from=R40&_vxp=mtr&_nkw=porsche+3.4
a 911 engine is anywhere from $7.5k to $15k. so, find out what the shop is asking for their motor; $5 would be a deal, $7.5k is more likely, and anything more is a rip-off. ps, prices in Canada tend to be higher as porsches cost more up here.
otherwise, a cayman engine should be relatively plug and play. I *think* the intake on the cayman sits a bit higher (the cayman has a taller engine cover) but the shop can address this with spacers and different motor mounts that lower the whole assembly. you should also install the 's' third radiator, which means a new front bumper cover and paint (or hack your existing cover). regardless, I don't think you are adding any value to the car by doing this, so think: $5k roller + $7.5k engine + $2.5k third rad + $5k install = $20k; is a 2003 base boxster hotrod worth $20k? just about in our market, but if anything costs more than what I've listed you might want to think about selling your roller and getting into a 987.
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