As said AET is probably a good place to get the turbo from - have supplied various turbos to people on the RSOC with FRS & havn't had any complaints
Manifold wise best on the market is from Primary Designs but your looking at £1300 for one but as said price is due to the quality & fact they produce exhausts/mani's/etc for over 1/3 of the F1 grid, motorbikes, etc, etc
Best value for money manifold is probably the one made by Blueflame tbh
http://cgi.ebay.co.uk/FORD-FOCUS-RS-...1%7C240%3A1318
These were built and developed off an RSOC members FRS & again quite a few happy FRS owners now running them on their cars with no probs
Only manifold to stay away from really is one branded as "miltek" generally available via Pumaspeed - they are NOT made or licensed in any way by Miltek & have been known to crack badly around the primaries