Hoodscoops seem to be mostly beneficial to WRXers and their top mount intercoolers. Most threads on this subject will say that rain will be a major factor to any cone filter place under/near the scoop (water ingestion). Though some have had success with the setup you describe.
IMHO I have a MY01 RS and have a Ganzflow+K&N panel setup (CAI Tube+Filter= $110). Intake sound is great and air flow is smoother. There is a thread in the N/A forum discussing air temps of different CAIs. There are also a ton of thread in that forum about conefilter style CAIs.