"...wanting more open, airy and extended sound. I want to lose the slight veil currently existing in my setup that just takes away from the believability of the presentation. I'd like more dimension as well."
Loose, a couple of questions. Are you able to borrow equipment from a local dealer or from friends? If you have a local dealer, audition some systems that get you closer to what your ideal sonic presentaion might be and then borrow the integrated amp or separates in that system and take them home and drive your speakers with them. If the top end becomes more extended and the soundstage opens up, then you know the problem is with the Sugden. If it does not, then you know the problem is with your speakers and then you can perhaps audition some speakers that are a better fit with your Sugdens.
What are the specs on your speakers (sensitivity and impedance) and on the Sugden (power)? I couldn't find anything on either of them. It could be that the Rega ARAs and the Sugden are just not good matches. Finally, depending on what your budget is, you can potentially scratch both items and start from scratch. A good place to start is The Absolute Sound as every year they have an issue where they put together complete systems (speaker, amplification, source and cabling) in the under $5K range and some are in the $1k-$2K range for the complete systems, so for just the speaker and amp that should come in considerably less. If you do not have these older issues from earlier this year or prior years, email me with your info and i can fax you or mail you copies of their suggested systems. It's a good place to start as any, as these systems at the very least are properly matched. Good luck.