Call Intuit and see what they can offer you.  For your volume, I suspect PPR may cost the least.

If you have not considered ProConnect Tax, which is Lacerte's cloud-based sibling, you should take it out for a spin.  It has the same Lacerte engine the hood and that means it is capable of preparing returns with the same complexity.  When you test drive the product, however, you'll find that it doesn't come with the nice-to-have bells and whistles.  Depending on your needs, the price point of ProConnect Tax may be more palatable to you.