Would these feats be good investments?

[Frosty]

In general, is it worth it for a spellcaster to invest 3 feats if it gave you these benefits as a package?

DR 4/Silver
+3 Will save vs Enchantment effects
Spell Focus of your choice

[Azerian Kelimon]

NAAAAH. DR silver is more or less the real kicker there, and it's still REALLY weak. Focus is useful for gaining entry to PrC's, but you could have gotten it as a single feat instead of three. I'd pass on it, and get Mineral warrior and buy it off, really.

[Fax Celestis]

You're talking about Heritage feats, aren't you? Most of them really aren't that terrific, and these are...well, alright. Nothing stellar, and you could certainly do better.

[Frosty]

Not really looking for prestige classes to be honest. These probably aren't the strongest, but still, DR 4/<anything. Well, except Magic, because DR/Magic is worthless> at level 1 is pretty sweet.