It really depends on your budget?
You could try the likes of Apex, HSD or Driftworks. There's group buys on the SXOC or Driftworks so you could get a set of comfy Apex or HSD's for about €500 I think? They've got dealers in the UK so postage is pretty cheap and the aftersales service is still close enough to home...
You could get a second hand set but I personnally wouldn't. For example; Drift 2 motorsport bring in second hand HKS coilovers for about €600!
DC, D2 and K-Sport all do coilovers and have Irish agents - they're all in the region of €1,000.00 though...
Or you could go to the likes of Perfectrun or RHD Japan and order teins, HKS, Cusco etc new and spend anythin up to €3,000.00!
If it's any help I've just spent €1,000 on a set of Driftworks CS2's, they come highly recommended on this site and the delivery to Ireland was only €30 or something. They come with a warranty too which is reassuring! They're not on the car yet so I don't know what they're like!