I generally just use a cheshire for collimation. mines a andrews cheapie but it seems to do its job
I cant really comment on a telrad as i have only used one a handful of times and without success... I guess its what ever suits you but i found it dificult to use.
you are heading down the right road for the barlow so I dont need to comment there
EP's... hmm... although they arent widefield (dont limit yourself too much) televue plossls and celestron ultimas are great EPs and probabably in you price range
GSO SV EPs probably wont work too well in your scope (F5 isnt it?) but at F6 the 15mm is quite good....