I'd go with the Ultra Pro 60$ on Amazon, then do one of these two choices:
Plan A
Customize and leave threaded:
New bars 70$
New wheels 50$
grips griptape 15$
Flexy $20
Total:205$
This is cheaper but not exactly better, in terms of strength.
Plan B
Convert to threadless:
Proto SCS 60$
District Headset 31$
JB weld RUP forks (this will convert them to threadless) 7$
Paint bars 10$
Get new wheels 30$-50$
Grips and griptape 15$
Flexy (make your own)- 5$
Total:237$ max
I would spend a little extra and do plan B, it will be better in the longrun, but if you want extra money, plan a is the way to go.
PM me if you have any ?'s
Hope this helped