Yeah, the price of the box set is the clinching factor, isn't it?
If I were to recommend LP's, then I'd have to say
Hex Enduction Hour, if only because it is so popular amongst fans. Not one of my favourites though.
My preferences:
Bend Sinister, The Infotainment Scan, Cerebral Caustic, The Unutterable, Real New Fall LP, Fall HEads Roll.
Good live LP's include
Seminal Live and
Live at Phoenix.
There's so much that they've done - it's worth going to the excellent
Unnoficial Fall Website and browsing there.
There's studio LP's, live LP's, compilations, compilations of alternative versions, about 90 LP-style releases in all! Browse the LP part of the dicsography.
And get the Peel Box Set!