I'm actually currently playing a very similar scenario, but there was no requisition that "all must ve arcane casters" so I'm playing an inquisidor with hidden arcane-warlockish powers.
Anyway, the two suggestions I'd make you are a changeling wizard 4, master specialist 2, recaster 7.
Recaster is from races of eberrom I think, it's a changeling-only PrC that adds a lot of flexibility to an arcane caster. Great for surviving. If you are changeling you can grab the wizard substitution level at 1 and get dual school specialization on transmutation and illusion - two extremely useful survivalist schools. I won't go too deeply into it, but take a look at the combination... you grab Spell Focus for both schools at first level, as you are human, and when you go into Master Specialist you'll get Greater Spell Focus for both schools for free. You'll also get free skill focus (spellcraft), which is a requirement for Archmage - you could PrC into it after recaster.
Recaster itself gives you extra spells that can be from any list whatsoever and free use of some metamagic quite a few times per day (including powerful things like quicken spell). And you could start with a level of it.
Another possibility is maybe a Wizard-Initiate of the Sevenfold Veil - Archmage. I never really tried Initiate much, but it's quite a powerful defensive class.
Also, you might want to take a look at the Defiant PrC from Planar Handbook s he gets all kinds of shenanigans against divine magic, and some with really few levels. There are some nice defensive feats I like as well: Insane Defiance lets you take 1 WIS damage and redirect a mind-affecting spell cast at you to someone else, and the person takes -4 penalty to the save. COmbine that with a level of binder (If you bind naberius you can heal 1 point of ability damage per turn) and you are not only immune to mind targeting spells, you actually reverse them on the casters.
Also, if you get evasion from some class, you can trade it for the Spell Reflection alternative rogue class feature - if any target spell misses you, you send it right back at the caster.
I combined those two on a recent Warlock 7 - Rogue 3 - Teflammar Shadowlord 4 - Infernal Warlock 3 build I'm playing.
Teflammar gets perpetual 20% concealment on darkness - not that great, but it becomes 20% chance to redirect a spell cast at him. Get a high touch AC somehow, and it'll up your survivability. You're a glaivelock already, so you dish tons of damage (Teflammar gives you shadow pounce - the ability to attack every time you teleport, and warlocks have at will dimension door. Teflammar has shadow jump, which I think is a move action. As per my DM agreed, at least, that allows for 2 full attacks on one turn.) I also got a spring-loaded gauntlet from pathfinder - a nice mundane item that lets you retrieve one item as an immediate action - in your opponents turn. I put a greater glyph seal on it loaded with dimension door and bang, 2 full attacks on your turn and another on the enemie's. And he misses his attack.
One level of mindbender + mindsight can do you great too, as can someway to get 2 level arcane sorcerer spells, so you can get the Wings of Cover spell (it basically negates 1 attack, spell, psionic power or anything really targeting you, but it is a sorcerer-only spell). You could even go Recaster and take it on your wizard, altough the limited spells per day won't let you make full use of it.
And gishes are fine too. I like weird builds, but Wizard 1 - Fighter 2 - Duskblade 3 (Channel spell!) - Abjurant Champion 5 - Some PrC that offers full BAB would be fine too (In this build, Swiftblade and Jade Phoenix Mage are ideal, but you don't have access to them, unfortunately...)
Anyway, hope my two cents are any good.
