I run these tyres on my Elise, but obviously different sizes 195/55 x16 F 225/45 x17 R, £600 for a full set, so I doubt you will get them much if any cheaper. The rears last 6000 miles including 3 trackdays generally on an Elise, the tyres I use have a specific compound for the Elises, so a harder compound might be needed for the DC5.
The Advan and the A048-R are different tyres, the Advan in Evo 8 sizes is drip feeding into the UK now.