If you are freelancer in home office, rack machines are definitely not what you want, it's too loud and tricky to maintain or upgrade as TomG allready point out.
Also, keep in mind that those Xeons X5680 are old 6/12 CPUs, slower than actual mainstream CPUs like i7 or R7. Xeon E5530 is even worse, it's only 4/8 @2,4GHz.
96GB of RAM looks tempting but it's old DDR3 RAM, slower then actual DDR4.
If you don't need more than 64GB (which is limitations on mainstream platforms) go for two cheap Ryzen 7 render-slaves with older R7 1700 (it's under 150€ now), or just one machine for start if budget is really tight. You don't need some high-end motherboard, some in 100€ range would be just fine (older B350 chipset) and some better CPU cooler (50-60€ range) if you want to overclock. Prices of RAM is finally drops so you can find 2x16GB kits for 250€ and add another one when you can. It's cheap, flexilble, ordinary build that you can upgrade or could easy sell when you don't need it any more.
Second option is, of course, Threadripper 1950X but it's much over budget (X399 mobos are expensive and need 4 sticks kit of RAM).
Third option is, if you can wait few months, new gen of Ryzen (still rumors, but 12/24 models are almost sure thing, with even 16/32 possible).
(On Computex, May 27th, Lisa Su, CEO of AMD will probably reveal more details and specs).