That's definitely enough fruit and veggies for one day. Don't feed too much broccoli as it can make them gassy and cause upset stomachs. Banana also isn't a very good thing to be feeding too much of. Red bell pepper is very good as it is high in vitamin C.
Try feeding him some other fruits and veggies as well, like carrot, celery, apple, cos lettuce, green bell pepper, spinach, cucumber, and parsley (I have found these to be quite popular).
Vegetables must be introduced slowly, to avoid digestive upsets. Once introduced, you can supply a variety of them to your pet. Variety is the key to maintaining your guinea pigs health. So be creative.
Also make sure your feeding your little piggy unlimited amounts of oaten or timothy hay, and 1/4 cup of pellets daily.
Visit http://guineapighut.webs.com/diet.htm for more information.