Eldritch Knight tree, on its own, is pretty meh. Spellsword, melee caster does work, but not because of EK. EK does have some use as utility/support tree.
Easier with Wizard then Sorcerer. Reason:
- to do something in melee, you need to spend feats. To do something with magic, you need to spend feats. Thats lots of feats. Wizard gets a nice number of bonus feats. It makes things much, much easier
- there is Harper Agent tree. It alows you to use INT for to-hit, damage and even more damage. Main stat for Sorc is CHA. Main for Wizzy is INT
- theres even a feat called Insightful Reflexes (you use INT for reflex saves). A wizzy can use INT for 3 things: fuel spells, combat, reflex saves
Casting and combat:
- you can't do both at the same time. Can't cast Fireball and swing a sword at the same time. No go. Even worse, theres a nasty delay between swinging a weapon and casting a spell
- the way to bypass this are Damage Over Time spells (DOT). Cast that Ice Storm and then swing that sword while DOT is ticking.
- cool part about DOTs is that for most parts they have no save and cooldown are not that important(they have solid duration). This, in a way, solves Tenser side effects
Race (survivability): any race will do, but Warforged and Drow are a bit better. Reason:
- 'forged can repair themself, get better CON, some nice immunities
- while any race can go Pale Master, Drow get a couple of nice perks: better INT (your main stat), cheap DEX (for TWF), ASF reduction(easier to put on some armor).
Combat style:
- you want "ranged", go Artificer or Ranger. You want melee with some Crowd Control, go Bard
- melee + DOTs
- all tree melee styles will work (2-handers, 2-weapons, single/orb weapon). Annoying: 2-handers need some STR for feats, TWF some DEX, not many Orbs around (especially not at low levels)
Multiclassing: not required. But if you go lets say Wizard 20, then why not just be, you know, a Caster
Enlightened spirit? Those blasts kill stuff fast. If mobs dead, why you'd need a sword?