Deciding on Where to Go...Warsaw & Budapest

From Temp

After some researching on the ol' net, I have decided to go with Warsaw, Poland and Budapest, Hungary for starters.
Now I will have to begin to search the Couchsurfing.org database for someone to host me, otherwise it will be another lonely night in a Hostel.

I will either take a flight from Oslo Airport or a ferry from Copenhagen, Denmark or from Stockholm, Sweden.
I suppose I'll take whichever is less expensive, unless of course it's a terribly long transport.

Any tips and recommendations are very welcome.