Definitely none of those. Moar platez, is the first thing I would consider. and/or an upgraded barbell / rack / bench, depending how good those things were to begin with.
A nice pair of spinlock DBs, perhaps. Gah, so many other things, actually...
^ The prowler idea is nice, too.
6'2", ~100kg (~220lbs). 40yo, training (with a few breaks) since my late 30s.
Squat 160kg (352.7lbs), Bench 112.5kg (248lbs), Deadlift 220kg (485lbs), Strict Press 75kg (165.3lbs)
My training log