Silk, Sirui, Outdoorsman, and others all make great options. I did not find the Vortex Summit tripod to be very steady (I have a Nikon ED50 scope and Leupold BX-3 10x42s so relatively light optics).
I'm using the Vanguard Veo 2 Carbon and it's dang hard to beat for the $$. Light, and solid as a rock as long as you take off the ridiculous rubber booties they put on the feet. The legs ends have steel caps on them that have stood up great to abuse so far.