Understand that completely, but I still need to understand the ballpark cost for building since that dictates the budget for the land. What I don't want to do is spend $150k on land and find that my remaining budget of say $250k isn't enough to build with.
$250k will probably not be enough to build with, unless you seriously change the scope of your house to be basically a 1400-1500 sq foot box.
I looked up the numbers on my sister's quote. The builder told her "no problem, we can do that for $125 /sqft" when she showed him that link I posted. She bought the plans, got the septic stuff done, and a couple other things, and his actual bid came back at $165 /sqft. At 1700 sq feet, they thought they could get the house for $215k-$220k and then add exterior stuff (were shooting for $250 max), but the bid came back at $280k with no driveway, no landscaping, no septic, and looking at closer to $315k+.
The house you posted is nicer and larger. Take it with a grain of salt, because you might get a better bid, but these are legit numbers from February of this year. My sister and her husband ended up buying a 2500 sq foot house for $255k...4 bed, 3 bath, bonus room, best elementary school in the county, 2 car garage.