With the Ttap and Gaffa, you can certainly go very far already, both are paid but are worth it.
Adding the dm-GrainDelay (free in Beta) and you have a whole universe…
Got the TTAP and Gaffa already! Will have a play around! Definitely want to play with CV stuff to see if I could implement a swell effect there, not a million miles off the Karma Police ending effect I saw posted here a while back.
The Gaffa in my opinion as well is a very good one. I also recommend the floaty from remaincalm. This is not a tape delay but you can also do funny things with this. I sometimes use it in combination with Gaffa to get my results.