There are lots of recordings of Holst's Planets. I have one of the LA Philharmonic that I don't recommend. It's not engineered all that well and actually has some digital clipping. I've got a Scottish recording on vinyl that's much, much better.
One reviewer there recommended the LSO's performance conducted by Geoffrey Simon under the Delta Entertainment label. I haven't heard it, myself. In any case, read the reviews and choose accordingly. Depending upon the balance of the instruments, different recordings can sound like totally different works.
Also, you can get the whole score (all the planets) for under $20 from Dover Press. I bought this (and Stravinsky's Firebird) and have really enjoyed studying it.
Jon, thanks for that! I was buying two books from Amazon which totaled $24.87. I needed at least $25 to qualify for free shipping (I'm such a tightwad!), but couldn't think of or spend the time finding anything else costing at least 13 cents to buy. Now I'm all set!