I am currently in the process of building the Tamiya StuG III "Finnish Army" version. It is my favourite model so far, and I would like to go "all out" with it

My question is - should I get the Tamiya set or should I get some other brand's PE parts (or both) ?
Below is a link to a shop with all the PE parts listed...and the list is massive! I'm blown away by the options, which should I even consider?
http://www.model-making.eu/products/Sturmgeschutz-III-Ausf.G-Finnish-Army.html
I'm pretty sure I'll be getting the barrel.. (I assume its this one? http://www.model-making.eu/products/German-StuK.40-L-48-7-5-cm-Barrel-with-middle-muzzle-brake-for-Stug.III-Ausf-G-middle.html)
I'm mostly concerned with the visual effect ("eyecandy") of the exterior rather than accuracy, although I'll be trying to depict the following StuG ("Marjatta"):
http://www.andreaslarka.net/ps531019/ps531019.html