Check to see if its now code that a basement be poured concrete as some communities have adapted these by-laws.
Having an older house (1958)my house has cement block walls.They are alright,but it's what they did at the time.
And do check for how many outlets are or could be installed as you may need several for your layout.And check how many additional breakers the box has for future reference.
If you buy an already built house, ask what their building technique was when constructing the basement,drains,sump pumps,outer barrier (gravel,french drain,insulation,etc.).Sounds like a lot to ask but as you well know a home is a big investment that after the facts is hard to deal with and costly.
Also check the ceiling for places to install tract lighting and the feasibility of running the wires to them .
And as mentioned, check where the plumbing and shut offs run.
coloradohiraile you have the same problem I have although my basement was already finished.Not enough lights or outlets 
makes it rough trying to plan a layout.
