Thanks alot for all your comments. Btw, I managed to convince my friend to loan me his d70s. So money is saved.
Regarding the sweden trip, i will be at stockholm for the first few days, have yet to look for accomodation. and for the next 3 weeks, i'll be in Jonkoping University. the sch coordinator will make housing reservations for us, however i have not recieve any information yet, most probably next week. so i have no idea where i will be staying.
and maybe for the last few days, i will most probably visit goteborg. or you guys have other suggestions? btw, is the car rental cheap?