Glad to hear the treatment is going well!
There should be lots of FlyBe Dash 8 Q400's, Embraer 195's and perhaps the odd Saab 340 of theirs although I havn't seen one for quite a while.
Also you should be able to see Ryanairs 737's and BMI A319/A320's. Recenty G-MIDX, the Star Alliance logo jet for BMI has been operating into Belfast.
Theres also the resident PC-12 Pilatus N234RG which I've seen a lot of recently, along with a few business jets.