| Here's my take on it...
Stat allocation will matter to your party moreso than in most campaigns, and that means you might make atypical allocation of your stat points in order to maximize survivability. (I'm not talking about "casting stats"- you'd do that anyway.)
Of your physical stats, I'd maximize Str and Dex before Con.
Why?
Max Str lets you do your best Brb impression by taking down foes before they take you down.
Max Dex improves a save, your AC, Initiative, and Ranged attack rolls...and if you take Combat Reflexes, your #AoOs. It will also offset your size increase AC penalty under most circumstances.
Con, while it contributes to both certain saves and HP, is an ablative bonus in combat. That is to say that your HP bonus is constantly eroding.
In contrast, AC rarely erodes. Generally speaking, a PC ends the day with the same AC (or better!) he started with. Its far better not to be hit than to be able to take a hit. (Admittedly, though, both is better.) | 
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