Prana zion pants (6pm.com), FL llano (look at the classifieds, with them releasing their new stuff you should be able to find some for cheap), Whatever military grid fleece you can pick up on amazon or ebay for cheap, decent puffy on sale from backcountry.com or similar sites, and cabelas space rain gear. Should be all set man. You can get two llano's and swap them out to reduce wear and tear and funk. Undies and socks are a personal preference, but I prefer merino wool for both. Just steer clear from cotton socks and underwear. Trust me on this.
All together, for a couple hundred bucks you should be set, if you just wanna run a rain jacket for weight savings, pick up a decent pair of gaiters, just make sure they're full length so you can keep water out of your boots. You don't need expensive clothing to hunt in, just stuff that fits right, drys fast, and feels good on the skin. I've spent a small fortune on clothing and came full circle. First year was budget stuff, second year all Sitka, last two years have been a mix of FL gear, this year I bought what was comfortable and what I liked, just so happened that it's also fairly inexpensive.