Basically,
Stick with the same colours as the i/c hose it will only annoy you at a later date if there's a mix,
Samco are good but pricy,
Normally a six week wait too,
Www.viperperformance.co.uk are worth a look, as are auto silicone hoses (ASH) on ebay/web cheaper than samco and normally both companies have stock in,
Header tanks depend on how deep your pockets are really, forge do some quality stuff but comes at a price,
Have you thought about an alternator cover and bits like that ?
Www.rally-tech.com do good stuff at reasonable prices too
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Something like this