I believe there won t be anymore hiring on the 320 fleet before end of year. there is currently a small pool of candidates who have been promised class dates in september and onwards. If you meet the other minimums, (2500 TT?,etc...) 1800 hours on the 320 should be plenty.
Also I suggest you take a look at 320 rosters before you make the decision. It s not a bad company to work for but on the 320, the rosters are far away from ideal.
Good luck.