i've always been opposed to vent-mounts, but when i got my pioneer inno recently, i decided to use them "temporarily" until i decided where to put the bracket. i have to say, i think i'm going to stick with the vent mount. it's pretty solid, and i ran the cables from the car cradle directly into the crack between the radio bezel and dash bezel. looks great, it's right at my fingertips when i'm driving, and contrary to what i feared, it doesn't flop around when i hit a bump.
as for running the antenna wire, i just used a thin piece of blunt plastic to push the wire into the gaps in the interior moulding from the back of my X up to the front. i did run it under the door kick panels, then back behind the glove box. you just have to be creative and take your time. the last thing you want to do is clip that wire. splicing small-guage coax is no fun, trust me.