Help amp for Vandersteen 3A sig w/ Anthem pre 2L

At your budget point, I would suggest a McCormack amp. You could certainly squeeze a DNA 125 in there. They really do well with Vandersteen's. Vandersteen's are not as easy a drive as some suggest. The DNA series have the grunt.
One of the better amps and the one I used with the 3a Sigs is the Theta Dreadnaught I. Unfortunately, they only show up every blue moon.
Richard V. has backed off biamping the speaker but a biwire is a must. I used a 4 channel Dread and didn't think it sounded as good as just biwiring 2 channels of the amp.

Thanks for the imput. I have really put your suggestions to the top of my list. Do you think that any of these amps, (Theta Dreadnaught, McCormack or ATI) specifically pair better with the Anthem pre 2L that I own. I have read other posts where people confirmed the compatiblity of these recommended amps with Vandersteen, but I am wondering if I am sacrificing anything by tring to force the Anthem into the equation...

I personally have had no experience with the Anthem pre so I'll reserve comment to someone else.
I can say that a tube preamp seems to balance out well with a SS amp with the Vandersteen's. I used an Audible Illusions pre for years with good success.