Buying a "Type-R" suspension, IMO, would be worthless. The ITR suspension, in terms of springs, are just a little firmer than what the regular integra has to offer.

What I would do is simply look at some Tein SS coilovers and be done with it. If you do want to get tricky, you can replace your rear lower control arms with ITR eyelet-style LCAs, and buy like a Tein HA or some other comprable setup, but unless you have a specific reason for doing so, it would be a waste for your money.