maxim, best I could say would be to shop around until you find a decent store who will fit you out properly and let you test ride. Don't rush in to a Lemond because the price is good. And trainers do not give you the same feel as a real road ride. You never have to take a corner on a trainer !

Saddles and pedals etc, are not difficult to change out, I suggest you read through the Park Tool website which shows you how do do pretty much everything in a step by step format.