Assuming I dont touch any components with the hose. and Im grounded. is it okay to blow the dust out. either by blowing through the front fans and or opening the case and just blowing air inside? I'd rather not buy can after can of air to do this. my house is dusty!

You want to remove the dust, not blow it around.

Blowing it out is fine. As a matter of fact, sometimes that's the only way.Personally I use a small vacuum and a small attachment and vacuum the bulk dust out. The only components I blow canned air into is the video card and my H50 radiator (and the air filters on each case fan). Blowing air under the video card's heat sink shroud is important. Make sure to focus on areas like that, that air is pulled through but you can't necessarily see.I forgot to mention. Blow air through the PSU's intake.

we use a shop vac here at work and SUCK it out, but have to be VERY careful not to touch anything with the hose, hose nossle, or anything else. Even being grounded, this time of year can generate a LOT of static in heated rooms.

I bought mine from Amazon and I really like it.http://www.overclock.net/t/1094261/metro-vacuum-datavac-clubGet this so you have a flex hose, makes it easier to get the airflow where you need it.http://www.micromark.com/miniature-vacuum-kit,7651.html

I take my rig outside, use a shopvac on blow setting.... and blow everything out....