High Mount lengths and prices?

Ok im new here and have some questions on highmounts. Some of you might tell me that these questions have be asked 100 times why dont i use a search but here they are.

I love the look of the high mounts, and im trying to decide on what i want.
In some pictures that i have been looking at on this forum, some of the high mounts look shorter then others, which is the look i like. Maybe they are the same size? , and they just look smaller in the pictures i dont know.
so what im asking i guess is who makes the shortest/smallest one? I just think that the standard size high mounts look kinda weird sometimes. also are the Indigo anygood. Im guessing they are the greatest because the full system is only $715 on their site. I really like the looks of the M4 highmount.
some of the names i have been looking at is
M4
Devil
Micron
Blueflame

Also i didnt want one thats going to be crazy loud.
I have a 04 silver/flame R6
If im leaving anything out that would be helpful please ask. Thanks
O yea I would love a full system but it would have to be under $800
which doesnt look promising. thanks for the help