I'd recommend looking at BrakeDepot.co.uk their Evora discs are a V.good price (only used for rear disc though).
Or Eurocarparts have numerous options, but remember it's a lump of steel really so not sure how some brands get away with the price charged.
And just my two pence...
Drilled look good but otherwise I personally would avoid as prone to crack when get hot (depends on how you drive I suppose)
Grooved good for looks and cooling, not prone to cracking / hot spots, will wear out pads quicker than plain discs.
Plain discs, maximum pad to disc area contact = maximum friction.
So in general if for looks go drilled / grooved. If maximum cooling (heavy breaker, fast driver) Grooved. Track use, plain or grooved if have cooling issues.