Best Respighi Pines of Rome

Agree with the Reiner/Chicago recommendation. Classic Records reissued this performance on vinyl and they're currently offering it for sale at $15 on their website.
http://www.classicrecs.com

Charles Dutoit, Montreal Symphony, London LDR 71091
This a digital recorded LP that is also on CD.
This is a colorful piece, so the digital master brings it out, not to mention this is a very good permformance (IMO).
It also includes "The Fountains" and "Roman Festivals". Most LP sets usually have just The Fountains.

Other good choices on LP are (in no particular order)...

Von Karajan, Berlin Phil., Deutche Grammophon 2531 055

Charles Munch, New Philharmonia, London Jubilee 41024

Ormandy, Philadelphia, CBS Records MY 38485

Feccia, New Philharmonia, Quintessence 7058

And the Reiner recommended above on: RCA ATL1-4040

MFSL - Maazel and the Cleveland Orchestra. I've heard, but can't confirm, that the original Decca was even better.

I have the decca Maazel and it is exquisite!

The Decca has been reissued by Speakers Corner, I believe. Got one coming to me. Also have the UHQR of this recording, will be interesting to compare and see how much MFSL jacked up the bass. I also prefer the Reiner recording (the Classic reissue is stunning), and the Frescia is a very good interpretation and was released years ago on CD by Chesky, but sounds a little thin and steely even with the decent Chesky transfer.