We've hunted around Eldorado for a number of years (Schleicher County).  There are some real hosses out there, as long as they can get mature.  The rain the last couple of years has been excellent, as well as the acorn crop, so the deer are in great shape.

 My son took a mid-120s 3.5 YO 10 pt buck (his first) in 2005, I took a 120s 6,5 YO 8 point in 2006, and my son took a 125 4.5 YO 10 point in 2007.  We've both been holding out for some older deer lately, though we've seen several 120s+ 3.5-4.5 YO bucks along the way.  Suspect our top end will be in the upper 140s for a 10 point or better.  A friend of mine also hunts west of Eldorado, and that's what he's seen as well.  Here and here, and here are some other links with examples posted on this site.  If you want more just stop off at Farris Taxidermy on the west side of Eldorado - he usually has some doozies there too.

You're going to be a little early for the rut, as it usually gets in full gear right around the first of September.  But, you never know.  Either way, there should be some great pre-rut activity there.

Hope you get a hoss!

By the way...the 6.5 YO buck went about 165 lbs, the other two in the 125 lb range.  Weather can be all over the place that time of year, 20s to 80s, and expect pretty rapid changes too so bring gear for warm and cold weather hunting.  And, I've been in cold weather, but some of the worst weather I've seen is this 33 degrees and rainy they have here! 

Depending on where you hunt I doubt you'll see 20 bucks a day, although the deer populations have been pretty good the last few years due to rainfall and available food.  We hunt in the an area that has an abundance of Live Oaks so its hard to see a long way (there are also areas where there are some big mesquite flats - you can see further there).

Hope this helps.

Here's a video of the Schleicher County area - sorry there's no sound.  If anything it'll give you an idea of what to expect as far as the terrain is concerned.  They also show some exotic game on this clip...not real sure how prevalent they are because we don't have them.  Maybe this was taken at a high fence place, don't know.  Either way I've seen bigger bucks than this taken low fence out there.

Also, please excuse the typo (thick fingers and brain) on my first post...meant the rut kicks in down there around the first of DECEMBER.

We've hunted Eldorado several years, harvesting 156 , 144, 142 , 141 7/8 and many high 130" class bucks. Antlers should be above average this year. The tough part is holding off on the 120's for the big one. The young bucks are chasing does now, the rut kicks in from around Thanksgiving until mid- Dec. Shots can be long , up to 250+ yds. and quick if the big ones are chasing. Be sure your gun is sighted in well. Take advantage of your time in the stand and sit long hours. I'm forunate to be able to take vacation and hunt approx. 6 weeks.Enjoy your trip and GOOD LUCK!

        Eldorado 2007 harvest.