You should also download a copy of our FAQ document (just follow the FAQ link top of page) and the "New collectors FAQ". It has a great deal of reference information.
Your budget is enough for most collectible Lugers. The key is to find a trustworthy dealer, and do enough study to understand what you are buying.
Reference material and study will save you from making errors and pay back much more than the cost.
You should also consider getting
Geoff Sturgess' book from SImpson LTD in Illinois.
__________________

Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.