I'm going to second Joc3021's recomendation for the GMA Rio.
I'm a mastering Engineer in San Francisco and have been searching for a pair of speakers, I can live with, for the past 3+ years. I'm very familiar with the adam 2.5a and s3a and niether can hold a candle to the Rio. I just finished breaking-in my pair and have been working on my first mastering projects since taking ownership.
They are the TIGHTEST and most ACCURATE pair of two-ways I've heard, By far. FYI, I've auditioned everything the pro-audio market has to offer ATC, Barefoot, Proac, Adam, K&H, PMC, JBL, Genelec, Meyer etc.... and none are as clean or natural sounding as the Rio.
I feel like, for the first time, I'm really hearing what my eq's, compressors, limiters, codecs and different, dithering algorithms are doing to my audio. I'm making eq and compression decisions much more quickly and not second-guesing them. In other words, my quality of work has increased and the length of time it usually takes me has decreased significantly. More free time.
The owner/designer, Roy Johnson is a pleasure to deal with and REALLY knows Scthuff!
If you're anywhere by sf feel free to send me a message and you are welcome to hear my pair.