Does anyone remember how a Power Mac used to be a power house of computing? Now it resembles something like a vase for flowers.
The PowerMac line ended in 2006, almost a decade ago. The fact you could use one as a flower vase proves the superior design - there aren't many computers that can be reused in such a way once they become obsolete!
If you want to use a Dell, I would advise to pick one from the "Business" line of products (Lattitude), instead of the "End-User" line (Precision).
Vostro, Latitude and Precision are the business line laptops (in increasing order of build quality / reliability). Inspiron, XPS and Alienware are the end-user / domestic lines (again in increasing order of build quality).
The longer the title, the less important the job.