I'd like to second Newbee's recommendation of the Barber CDs on Naxos. I have the four Barber orchestral CDs with Marin Alsop conducting the Royal Scottish National Orchestra. All are excellent and have first-class sound. They same is true of the Bax cycle of symphonies and tone poems with David Lloyd-Jones conducting the Royal Scottish NO: all excellent and all with fine sound. (The Bax cycle is being completed this month with the release of Symphony No. 7 and Tintagel.)
I find the Naxos catalog particularly strong in 20th-century British composers: Bax, Britten, Walton, Vaughan Williams, Bliss, Rawsthorne. All of these that I've tried have been good. If you have the 2003 Naxos catalog, it identifies recordings that have received favorable reviews, tells you where the review appeared, etc. I've tried just buying the ones that have several good reviews, and as far as I'm concerned this has worked well, because I've been pleased with every one of these I've bought.
I find the Naxos catalog particularly strong in 20th-century British composers: Bax, Britten, Walton, Vaughan Williams, Bliss, Rawsthorne. All of these that I've tried have been good. If you have the 2003 Naxos catalog, it identifies recordings that have received favorable reviews, tells you where the review appeared, etc. I've tried just buying the ones that have several good reviews, and as far as I'm concerned this has worked well, because I've been pleased with every one of these I've bought.