need advice

hi everyone
i'm taking a weeklong trip to smoky mtn natl park in nov. i'd like to
flyfish while i'm there. i've never flyfished before and have no eqpt. i
understand the trout there are small and all i need is an ultra lightweight
outfit. talked to the guy at orvis and he said i should get a heavier
outfit which would offer more versatility. i see myself fishing 3 trips a
yr to the smokies. i understand the ultralites are more fun and challenging
w/ small fish. i'd hate to outgrow the outfit if i wanted to fish for
larger fish. is there a compromise? what should i look for and who's got
the best deals. thanx guyz, rick