Just another thought Dave,
As much as I (like 38thBeatle) love my Jensens, I remembered that Thin Lizzy used Celestion Greenbacks in the 70's and that comparitive reviews seemed to speak of them as being very midrangey.
From the description of your tonal needs I would be therefore very tempted by the 'Greenbacks' in your situation.
Please let us know what you eventually decide on, as I currently have a 4x12 cab loaded with the more general purpose Celestion GT 12-75 speakers, and may in future years wish to re-voice it along similar lines to yourself. This does not negate my love of the Jensens, but I have already enough gear with them in and prefer to have at least one 'outboard' contrast.
All the best Dave,
FF.