Hey Nick,
If this were my tree, I'd do the following. Cut it back down as indicated on the photo.
2011-05-27 10-16-18 AM.jpg
This will get rid of the tuft up top and give the trunk beter taper and thickness relative to its height. Try to wire the main trunk to avoid the repetativity of the current curving, plant it out and feed feed feed the tree. Allow for a sacrifice branch on each foliage pad (preferably one growing to the back and relatively close to the trunk so the scar is not obvious when you cut it off), but continue to nip and trim and wire the foliage pads to get some shape. Personally, I'd make the two bottom branches a bit less wide. You could do this by either trimming them or wiring more shape into them.
If you want to get really daring, graft a bud low down on the back of the tree and if you get it right, you can grow it out as a sacrifice branch to thicken up the base some more, improving taper even more. If you get it wrong, it does not really matter as it is on the back.
As far as the jin is concerned, I reckon you might take it right down in time, but don't rush that decision just yet. For now, just preserve it well.
I'd pot it into a grey oval pot (a reclangular one may also work, but time will tell. Found this nice one at:
http://www.bonsai-shop.com/Bonsai-Wendd ... ert-Oval-E
And this is what it could look like if you do all this. I think it looks cool if I may say so myself!
Juniper Virt.jpg
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