If you are stuck with three 90*'s, you could add some LB conduit connections that have a removeable plate so you can maneuver the corner with two straight runs. Here's a link to a 1/2" NMC LB fitting, although they are made for metal, etc.
Jim
http://www.homedepot.com/p/Carlon-1-...-CTN/100404083
One can never have too many planes and chisels... or so I'm learning!!
There is a tool for cutting MC armor without damaging the insulation, Seatek's Roto-Split is the best one, while anti-shorts (redheads) are not required w/ MC cable, it is good insurance and they usually supply a small bag of them w/ the cable, + use connectors listed for MC cable not NM "Romex" connectors.
Get the Roto-split and not the Klein. Couple weeks ago I left mine at home and tried all the short cuts to not using it. Cut my hand requiring trip to doc and stitches.
I've got a Roto-Split coming.
I've done a lot of construction over the years and ridgid conduit just looks better, it looks like you cared about what you are doing. Flex does not give that look, it looks like you don't care and it looks cheap. This is my opinion and I agree with it 100%.
You want to use rigid conduit? That means threading pipe & higher costs, but I can guess that the post does not really mean rigid, which is a type of conduit like IMC, EMT & so on, EMT done well looks good, but MC cable is a staple of commercial construction & while it does not look as nice as EMT, it saves time & time is money.