honestly I don't have any experience with commercial rigs, but Ross and some other vendors will certainly have experience, maybe ask them?
Just my $0.02, it doesnt matter what gear you have, the fun is only taken out of brewing when *you* stop enjoying it, and only in exceptional circumstances could you blame your equipment for that. If you think you will gain enjoyment by building your own rig, then that's cool. But keep your eyes on the prize - you want a great beer at the end of the day - and that can be done from a pillowcase or highly automated professional gear, or anything inbetween.
FWIW, I would split your decisions in two - do you have the skills/want to build your rig, and make great beer from it - or - do you just want to brew great beers? Have a hard think about that one, because in my (granted limited) observations, brewers spend far more labour and often money (hidden cost!) on their rigs to achieve something comparable to a commercial product they could've bought to begin with. But, that changes depending on accessability of materials and skills.
At the end of the day, whether you wired it up yourself or not, a vessel is a vessel, its what you put in it that counts.