Lemurz,
Before you get bamboozeled by the IT speak you need to very clearly set out the scope, requirements and budget for this project - then you need to stick to them!
Spend as much time as you can actually writing down, in business terms / normal terms, what you want, how you want it to work and by when does it need to be working. Do not go to IT providers and say "What can we have?" because many will try and sell you all the bells and whistles.
And I second Rainydays advice - get professional help - in fact I just re-read Rainydays post and he has said the same thing as I; and he did it in one sentence!