if you want a good clean OEM look, get that tripple single din pod that goes below/above your radio... those look pretty nice, but it looks like you have the larger gauges, so i dunno if those will work...
AEM UEGO sucks balls... and the outer bezel is too big to fit a single din opening, i was going to run mine there.....

....... but like i said, the outer bezel is too big...
looks like the only option for you might be an A pillar pod, or a dash mount set up... i think the scooby (WRX), tripple dash pods are similar in contour the the S14 dash above the AC/heat vents... will prob need a bit of trimming, but looks good if done right....