What size is the Pocket Grimoire Arcane by Green Ronin? That's 240 pages, and a very handy size.
Personally, I'd think that you wouldn't need the entire SRD in one book. I'd keep spells in the Pocket Grimoires, and then add one book for equipment (including magic items), one book for combat (better organized, perhaps), and one book for character basics (races, classes, skills, feats, and spell lists rather than spells). A broad "pocket reference" for oddball stuff, like environment conditions, gem prices, etc., might not go amiss, either.
I would not be interested in a pocket monster manual - the only time I crack that tome open is when I'm running a combat, and I want it to lay flat anyway.
That's about $90 worth of books (at the $15 each Green Ronin price), but they would be more useful to me than the current PHB + DMG.