Online giving 3rd party platforms

Hi Everybody!

We're dissatisfied with our current custom platform for online giving (bsomusic.org/giving/donate/).

We're looking for a relatively plug-n-play solution for online gifts that:

• has good usability,
• offers options for monthly giving,
• is PCI compliant,
• integrates well with Tessitura,
• is as Plug-n-play as possible
• can be embedded on our site 
• is flexible (accepts input for source codes, gift amounts, etc. via parameters)

Honestly, except for the Tessitura integration, Paypal seems to offer a strong solution.

Could you share your own online gift processing vendor and pros/cons?

PS: If we were able to identify even a temporary solution for #GivingTuesday that would already be a huge help! Thanks for your suggestions!!