terrestrial is the way to go in ur case if u want such a big t. If you dont want to spend much money then L.parahybana is the one u need, grows quite large, sometimes hitting 10 inch mark, costs cheap, not very agressive, though it does depend on the individual. They are not very impressive looking colorwise. What i would go for if i were you is an Acanthoscurria geniculata, my personal favourite ( Brazilian giant white knee). These guys grow big, around 8 inches and stocky. I cannot find a negative thing about this species, they eat like mad, grow like weeds, look gorgeous gain color at a very small size, are not agressive but again depends on the individual. Dont cost much either.
Frankly, i dont totaly agree on the idea of buying a G.rosea or B.albopilosum just to get started, i mean if the tarantula doesnt need specific needs which is a story with many species and the guy doesnt care about agressivness, he should get the spider he likes right away. But deffinately get as much reading as u can, thats true. Great animals. Watch out theire addictive though
igor