Wotcha and welcome Tracy, nothing to add to what has been said. It may well be worth investigating a powerflow type exhaust system particularly if you are looking to keep the vehicle
I can vouch for Black Diamond discs and have used EBC pads - there is another thread on here discussing EBC pads and I know brake discs have been discussed.
Are your discs worn at the moment?
If not what I would suggest is replace the standard hoses with braided items and a full flush through with Dot5.1 fluid
Contact RichR I believe he is still on the lookout - although I believe he did want a WRX buuuut you never know as it is a really clean example
http://uk.subaruownersclub.com/forums/topic/12841-looking-for-wrx/
Wotcha and welcome - we have a few members on here with the new shape - very nice piece of kit - a remap sounds like an ideal first step - dont know about anyything more as Im not certain on the state of the engine internals and what they will take as standard
Here is Bens site -
http://www.carbenfibrecreations.co.uk/store/index.php?id_product=660&controller=product
and here is a thread created by him so drop him a line - a deal could be possible??
http://uk.subaruownersclub.com/forums/topic/10731-short-notice-carben-fibre-creations-meet-this-weekend-29th-nov-leeds/
Vented discs means they have a gap in the middle so from that angle they could be vented or solid you can not see
WRT the upgrade - what is you budget as the upgrades vary in price and spec but if I remember correctly to go the STI route will require new hubs and bearings as they are larger so you are potentially looking at WRX specific fitments - for a simpler approach but potentially you still have a wide choice
http://scoobyworld.co.uk/catalog/index.php?cPath=37_286&osCsid=tvb0qpa29cq7pc1dimatio9tj4
Rob - 55 is September 2005 to February 2006 so all is correct from what you have read.
Any chance you could post some pictures, may help with response?