As John said the Scroll Saw is better and provides a smoother cut for what you are wanting to do. A Scroll saw has two arms moving together providing even tension on the blade throughout the up and down cycle of the cut. A Jig Saw has a spring tension in the upper arm to pull the blade back up and also provides tension on the down stroke. Don't get rid of the Jig Saw though. It has it's uses. One thing it can do a Scroll Saw cannot is work as a Sabre Saw with the upper arm removed. A nice feature for cutting shapes in larger panels. I have both saws which I use for different purposes. I found my Scroll Saw, a gray one, used with a Power Station. A combination I like since it is not as bulky as it is sitting on a Mark V. Buying a stand alone Scroll Saw would be similar.
As for blades I have used blades from several manufacturers and have not had any problems with any of them. So no real recommendation for you.
Mark V 520 S/N 09-11-01 completely upgraded to Mark 7, with all SPT's & more.
Model 10ER S/N R64000 first one I restored on bench w/ Shopsmith metal ends & retractable casters. Has Speed Changer, Model 4E Jointer, Jig Saw with lamp, a complete set of original accessories & much more.
Model 10E S/N 1077 oldest one I have restored. On bench w/ Shopsmith metal ends & retractable casters.