There isn't a whole lot of flexibility in an all-Warrior list. Even if you're opponents aren't fielding the new nasty 6th ed stuff, Gauss Flayers will only take you so far, even in previous editions. You would want to include a Monolith at least to give you some teleportation/mobility options, not to mention a weapon that can handle bigger threats than standard bolter fire.
One of my favorite things about the new codex is that we aren't directly rewarded for taking loads of redundant units any more, ie Reanimation Protocols only take models from the same unit into account not nearby models of the same type, so there is a lot of flexibility in what to field even at low points (the cheaper unit costs helps too). I fully understand the desire to make a functional army with your old models: I'm sitting on over 3000 points of old Necrons and somewhat bitter about how all the best stuff is going to cost me an arm and a leg. Still, you'd be hard-pressed to meet with much success, I think, if you don't take advantage of any of the new toys and insist on limiting yourself to old ideas.
You have loads of good melee models that have just gotten better with the new book; if you want to make a go of it with just old models, why not run a melee-centric army using your Wraiths, Tomb Spyders, Scarabs (you could start with a reasonable unit and use your extras to bulk it up when the Spyders start spewing them out), and Destroyer Lord/s? Take Warriors on the cheap for claiming objectives and providing supporting fire, and run amok with a high-speed melee battery. Looking around, the Wraiths/D-Lord combo is working very well right now, and could be a good way to be effective without dumping all of your money into transports and other flashy new models.