I'm only familiar with Krell & CJ by reputation, but have not owned or listened to them. However, I own the 703's and power them with an older Audio Research SS (D-240). I utilize a Musical Design Tube preamp that has been tweaked (currently using some NOS vintage tubes) that really smoothes out the SS amp. I am very happy with the results. It took a long time for the 703's to break in, but now they sound very good. You could pick up an older model Audio Research for a great savings on Agon.
Keep in mind, regardless of what you read, amp technology has changed very little over the past decade. A great amp design ten years ago is a great amp design by todays standards. The real changes (very big changes) have been made in digital technology. Utilize this new technology with newer digital gear and find quality high-end amps with a little age (used) and enjoy that savings!
Good luck
2chnlben
Keep in mind, regardless of what you read, amp technology has changed very little over the past decade. A great amp design ten years ago is a great amp design by todays standards. The real changes (very big changes) have been made in digital technology. Utilize this new technology with newer digital gear and find quality high-end amps with a little age (used) and enjoy that savings!
Good luck
2chnlben