My daughter got married at the Stagecoach Inn in Newbury Park. Beautiful location- it was $1100 but I think they may have raised the price. You get a coordinator, a rehearsal the day before, you can decorate anyway you want, alcohol OK, music OK with no late time limits, beautiful nature trail for pictures, bell tower they will ring for you, dressing rooms, kitchen with fridge. You have to rent tables and chairs. They will also open the Inn for tours, which was a big hit. We did it all for 130 people for under $5000. We brought in our own caterer. Wedding was casual and caterer was Marshall's barbq in Ventura.
Another place is Strathearn Historical Park in Simi Valley and Oak Park Community Center. Both are very nice and within your price range. All three properties/ venues are listed on www.weddingcelebrations.com . Good luck!