OK, let's bump you to 8th level and rearrange your stats to something more suitable:
Original Abilities: Str(16), Dex(14), Con(18), Int(13), Wis(10), Cha(7)
Before mods: Str(16), Dex(14), Con(16), Int(13), Wis(10), Cha(9)
We're going to rearrange that as Str 16, Dex 10, Con 16, Int 13, Wis 9, Cha 14.
We're now going to make you a Ftr 4 / Knight 4 with
New Abilities: Str(16), Dex(10), Con(18), Int(13), Wis(8), Cha(12)
You are wearing Mithril Full Plate +2, wielding a Flaming Dwarven Waraxe +2, Luckblade (+1). You have an Amulet of Natural Armour +2, a large Shield +2, and a Ring of Protection +2.
Your saves are +12 / +5 / +7. You have 86 HP (on average). Your AC is 28
Your feats are Weapon Focus: Waraxe, Weapon Spec: Waraxe, Cleave, Power Attack, Combat Expertise. You have Mounted Combat as a bonus feat.
Your special abilities are
Fighting Challenge +1 which lasts for 6 rounds. You can do this 4 times per day.
Shield Block +1, which raises your AC by 1
Bulwark of Defense
Armour Mastery
Test of Mettle
At 9th level, you can take Melee Weapon Mastery. If you take a 5th level of Knight for your 9th level you get a bonus Knight feat and the Vigilant Defender ability. Then 2 levels of Fighter and take the two Shield feats mentioned earlier.
However, it appears that the party is used to having plenty of space in which to fight. In this case, you may wish to focus on a polearm with Reach.
Here's another alternative: Ftr 4 / Mk 4. You take WF: Natural Attack and WS: Natural Attack with the aim of taking MWM: Bludgeoning later). When in armour you fight with a heavy flail. (Or you could take WF: Flail, WS: Heavy Flail). Why not TWF with a quarterstaff? Well TWF or Flurry takes a full round.
The feat chain is similar. Remember that Evasion is usable in light armour, so you wear mithril breastplate. Remember too that many of the monk's abilites operate when in armour. Think Disciplined Warrior rather than Oriental Monk. And you'll be top in barroom brawls. Note that Power Attack works with natural attacks.
Stats should be Str 14, Dex 16, Con 18, Int 13, Wis 10, Cha 8.
Your BAB is +7 / +2, and you flurry (out of armour) for +5 /+5 / +2.