Precision 3620 is the oldest model and most economy available on your favorite shopping site, with a flexibility of CPUs choices and ample drive cages.  It's a mid-size between full tower and small form factor.  Suitable for several 3.5" drives (including optional hot swap features). 

Thanks for your suggestion. But the model likely is too old as it comes with the 6-gen Intel CPUs that this 6 generations prior to the current line. The 3431 might be a better choice.