Regarding the actual thread btw, of the players mentioned in the OP, I would like the following to stay:
Harper - sentimental reasons more than anything, I do think he's still competent for a number 2 but would understand if he decided to leave; wouldn't mind him as a goalkeeping coach actually.
Guthrie - fantastic squad player, can easily slot into CM when necessary but again would understand if he wanted to leave.
Perch - Can be useful at times and we do need a squad so would like him to stay.
Simpson - Okay, we do need a new RB/LB in the summer but I really think Simpson would be competent backup (despite his flaws). Whether or not he would accept a bit-part role is another matter.
Best - Again, another great option for backup imho. His goal record this season hasn't been that spectacular but he does give his all and certainly has some strengths which can be beneficial to us (holdup play, decent body strength and all that).
Elliot - Well, as unconvincing he may seem to be to some (myself included), he is the only backup keeper we've got (bar Harper). The new young'uns we've got in the reserves are definitely not ready yet. Also Forster is definitely off to Celtic imo. Having said that, if we manage to find a better backup keeper, then won't be too bothered if Elliot is let go.