Cheap compared to commercial LEDs but around twice what it should cost to DIY something with similar specs. And as much of a fan of LEDs as I am, I think it's a hair unrealistic to expect two of those to replace a 250w MH.
Jdoe, you said "fixture or DIY." If you're interested in DIY, you should check out some of the LED builds in the DIY forum, or the "mother thread:"
http://www.reefcentral.com/forums/showthread.php?t=1678127
Some others:
http://reefcentral.com/forums/showthread.php?t=1662682
http://reefcentral.com/forums/showthread.php?t=1751598
http://reefcentral.com/forums/showthread.php?t=1672708
On a 60g tank, you might want to start in the neighborhood of 30 - 40 HP LEDs depending on which LEDs you picked, drive current, optics, etc. My approach is to choose LEDs, drive current, and LED count to get the intensity you want, then choose optics based on mounting and height decisions (i.e. will the LEDs be 3" above a 12" tall tank, or 24" above a 24" tall tank?)
Most builds use a mix of cool white and royal blue LEDs. The current "best" cool white LED is the Cree XP-G R5 bin. The current "best" royal blue LEDs are the XR-E or XP-E royal blues, depending on which package you want.
If you want to match a typical 14kk MH lamp, you might use 20-22 royal blue XP-E and 14-16 cool white XP-G R5. That'll be more light overall than your 250w MH, but it'll give you a lot of wiggle room with placement, optics, etc. If you wanted to go "budget" and keep the LED count lower, and were going to use optics and/or light only part of the tank (for instance if you had live rock stacked in one island and didn't need to light the rest), you could probably drop down to 16 - 18 royal blues and 12 - 14 cool whites.
You'll also need heatsinks and drivers. The most common DIY choice for heatsinks is to get a massive extruded heatsink from heatsinkusa.com but that's arguably overkill. If you have good ventilation in your hood, you can use extruded aluminum channel as long as it's cooled well via fans.
For drivers, there are really two popular choices. First is meanwell products, i.e. meanwell ELN-60-48's (12 - 13 LEDs each, up to 1.3A, dimmable) or LPC-700-35's (12 or 13 LEDs, fixed 700mA, non-dimmable). These drivers can be plugged right in, no DC power supply required. The dimmable ELNs are nice but require a signal on the dimming circuit, which you can make via a wall wart and a few components.
The other popular option is buckpuck drivers, which come with fixed (but dimmable) output currents, and require a separate DC power supply. Driver choice is really a matter of personal preference, they all have roughly the same functionality and cost.
