This might make a good mod idea or something for Crysis 2 multiplayer
By classic I don't mean the classic mode that's in the game already with no nanosuits

But what I'm talking about is something like the classic Crysis 1 buying system
For Crysis 2 it could be like this: You start with a m12 Nova and no nanosuit modules, by killing enemies/completing objectives/etc you get prestige points to buy better weapons, attachments or nanosuit modules.
As an added advantage you can make the weapons more varied (you can make the Gauss a 1 shot kill but make it expensive, for example, or make the KVolt or X43 Mike awesome like in the campaign)

this would require hard work. but a nice idea though