If you want to play a summoner go Cleric or Druid. (Not only because of power gaming, but for rp-reasons, too. See below.) The Cleric has only one spell less than the Sorcerer but has two good saves, medium bab, a d8 hd, heavy armor proficiency, turn undead and his domain power. The Druid has two spells less, but can spontaneously cast the summon nature's ally spells. Since the Sorcerer knows only one level 3 spell at level 5 for instance, the Druid is a hell of a lot more versatile. On top he has more skillpoints, better bab, better armor, better weapons, an animal companion, wildshape and more hit points. If you play a Sorcerer do yourself a favor and just pick the best spells. You can't afford to specialize since you know so few of them. Pick up sleep, color spray, grease, web, glitterdust, stinking cloud, deep slumber, phantasmal killer (watch out, though right now you don't get any XP for killing dudes with save or dies), solid fog, otiluke's resilient sphere, feeblemind and cloudkill. And that's not against rp-immersion, it's actually the opposite. People who aren't good at something won't specialize in exactly this field. You wouldn't want to be a weak weightlifter in real life, either. If you want to play a Summoner, play a summoner and not whatever name DnD has chosen for its available classes. And the best summoners in this game are either Clerics or Druids. That's because when a Cleric casts summon monster he has the Cleric's chassis and when the sorcerer casts the same spell, he has the much weaker sorcerer's chassis. So for this round he's the bug sucker. The arcane casters have other things to do than letting Cleric and Druid show them how to do it right, like casting spells which their divine buddies don't have access to.