What is your basis for dismissing Slovakia? It certainly cannot be their results over the last two years:
http://www.fifa.com/worldcup/prelimi...esresults.html
After a slow start to their campaign, they simply got better and better. And I suspect their late home defeat to Slovenia was a case of nerves getting the better of them when on the brink of qualifying, something which they put right five days later by winning in Poland.
Of course, it may be that qualifying for SA (in a more competitive Group than ROI's, btw) may represent a "high water mark" for them. Alternatively, it might just provide them with the boost they need to push on even further. Remember, Slovakia traditionally provided the bulk of the players when the old Czechoslovak teams were in their pomp - especially the 1976 European Champions (8 or 9 out of 11?).