One more for YMYL.
You might like the part that talks about calculating the "real" income per hour and applying this to your purchases. For example, when you figure out that one hour of your lifetime gets you 10$ (after deducting commuting time and job related expenses) is a certain purchase really worth it?
Lots of good ideas in that book, even if you do not want to apply each of them to the max. In the related forums of www.slnet.com
there is a discussion about "buy or rent" going that might be interesting to you as well.
When thinking to buy, I would carefully estimate all related expenses from tax over heating to increase of furniture or decoration and cleaning. If you do not need the space it might not be worth buying.