This Zenner Could Really Use Some Help Please!!!

I have read every single one of these 254 pages of posts, but I am in somewhat of a confused state about which one of the EP modules to install and from where to download it.

I have Zen 138a..On PHP 5.2.1
My supplier sends me some sort of Jumbled up CSV file daily which has a heap of products most I sell some I dont.
My cart has already loaded by hand around 500 products only about 25 with attributes....
This appears the hot favourite Version 1.2.5.4 namely Langer's version from Modhole....

Also someone mentioned the following a few pages back..............Does anyone know anything about this? I am a little nervous about getting it.....at $ 149.00 and dont know what the benefits are vs the free versions.

Any help and opions would be really appreciated.

Thanks
Renz


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Store Manager for Zen Cart is a Windows application