Thankyou all for your responses
I managed to find this page with info on the species of beech, and how suitable they are for bonsai etc, maybe it can help someone else thats interested in these particular trees.
http://bonsai4me.com/SpeciesGuide/Fagus.html
european beech seems to be the more common species... ive noticed that they are mostly used for forest bonsai, thats something that i considered at first when purchasing it, but then i later found pictures on the internet of beautiful upright beech bonsai, personally i think it is well worth the wait for a thick trunk, and nice branch structure... so i think i will use this tree for a long term bonsai, maybe it should be planted in the ground for several years, what do you think? Ive read that it is the easiest way to get a thicker trunk on tree's like this...
-jason