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You are correct in not needing a dedicated GPU, the days of discreet graphics cards in laptops are numbered. The newer generation Intel processors (starting with ivy bridge) do an amazing job as stand alone units.
For ACAD and REVIT you need thinking power, not rendering power. Which all comes from the CPU not a GPU.
The exception to this is 3DS but as long as you do not go to crazy into 3DS which in your program they do not you should be fine.
As far as the 4th gen vs 3rd gen debate. It all comes down to battery life as that was the single largest change between the two gens. If you do not spend to much time away from a plug, then no big deal you can save yourself some change (lenovo has great deals on year old models).
If you want the latest and greatest unfortunately its going to cost you a bit more $$.
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