A dozen headings

Hello,

I will appreaciate any help with the following headings representing various features of a software application whose description I'm currently working on.

In 3 and 7-11, I offer some alternatives, but, frankly, I'm not sure all of the words I have used exist at all! :-D Please, correct whatever you find weird, and add options of your own if necessary. I'll be grateful for any suggestions.

I assume they're all meant to make the software attractive enough to buy, but I don't want to overdo...I'd like to make tham sound as natural as possible, yet as I'm not a native speaker of English, it's pretty difficult for me to decide which of the words collocate, and which don't...

1) Above-standard comprehensiveness
2) Excellent interconnectedness
3) Sophisticated meticulousness and (a) efficiency / (b) effectiveness / (c) effectivity
4) Maximum variability and openness
5) Easy adaptability to client requirements
6) Thoughtful timelessness
7) Permanent investment (a) guarantee / (b) warrant / (c) warranty
8) (a) Highly professional support / (b) Slickest support
9) (a) Complete / (b) Total / (c) Absolute / (d) Full security
10) Freedom (a) to choose / (b) of choosing a database
11) (a) Professional / (b) Expert hardware support

Many thanks for your help, and my apologies for the extent and varied character of my query.

Best,

P.