Your range and spread are more dependent on the reflector bowl and/or lens design. Without something custom, you have to change the bulbs to get better performance. You have 4 options for the bulbs that I am aware of.
Replacement bulb - I am not aware of any H8/H11 bulbs that will give you output anywhere near the factory HIDs. High-quality bulbs like PIAA are the best bet.
HID Kit - This is probably the cheapest route with best performance per dollar. At
under $45 shipped for a decent plug and play HID kit it's hard to beat.
LED Bulb - There is a HUGE range of styles and prices from $5 - $200 with performance mostly matching. The higher end models like
THIS and
THIS look promising.
LED-equipped replacement housing - These are complete housings like
THIS. Generally pricey. I have not read any reviews on them yet.