Well, I haven't played more than... one... game of fantasy... in 2011... but!
That looks like a solid core for a 500 point list, with infantry to hold up the advance of your foes and a solid knight force to flank and break up enemy regiments.
Handgunners are shorter ranged and will probably end up plinking at whatever your halbards are being faced by, but could also be used to slay the dogs and fastcav who will try to charge block your knights from the enemy infantry's flanks.
What's next for the 750 step up? A Cannon would seem like a good investment, but then you will need more infantry to hold the enemy off your backline as they seek to destroy it.