The "GTi" used the 150bhp 2.0 16v from the Golf Mk3 GTi 16v. This car has stats similar to the Clio 16v - mid 7s to 60 and 130mph top whack.
The Cupra editions use variants of the VAG Groups 5-cylinder 1.8 20v Turbo unit (in various states of tune from 150bhp to 180bhp). I would have thought that this would have been the unit that could be chipped to 190bhp. The 180bhp version had a 0-60 in the low 7s and a top whack of 140mph. Very much 172 territory, but the Cup would probably pip a standard one.
There is, as yet, no performance version of the latest Ibiza (unless you count the 130bhp TDi).