The feat you just edited in is actually called
Overwhelming Assault. It's usually not recommended, but in some cases it can work (such as if you're regularly denying the opponent actions like through Stand Still and such.) +4 is a decent attack boost, but not huge at that level.
Robilar's Gambit is a great feat.
Karmic Strike is another one to think about, but it requires the opponent actually get a hit in on you, so it's less than ideal. If you can gain worthwhile DR (at least 5) it becomes better.
If you're not allowed to take knockdown, take
Melee Weapon Mastery at 8th instead of Greater Weapon Focus. You might not even want to bother with GWF because it's only a +1 to attack. At 1st level that might be worth a feat, but at 8th and with its prerequisites it needs at least +3 to be worth it.