I think the best next option for your car will be a S5 Grill with a SE-R logo on it. It really look awsome but the compant was on back order for the last 2 months. I already contact with the guys and they will let me know ASAP when they have it in stock again. If you want I can let you know about it too but before everything check these pictures of S5 Grille first.....
ActiveTuning 05-06 Nissan Altima S5 Grille Gallery - ActiveTuning
Click on the images to enlarge, I still can't wait to get this one ....