To me it sounds like a good fit for your needs. I had a 1520 but returned it because, for my needs it was too big. Absolutely beautiful screen and it makes office docs and PDF's actually readable, don't know about working on one though. Since you plan on using it more as a tablet than a phone it seems to make sense.
If my requirements for a phone didn't include being on construction sites frequently I might have kept it, just too unwieldy for my needs. Using a 920 currently, might look in to a future phone with a 5" screen when and if they (929) are released