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Hi, and welcome to the forum.
Dont quote me on this, but I thought the D5100 did have bulb mode??
However,if you are looking at a top end Nikon DSLR then you will be looking at something like the D4, but at £4k is seriously expensive.
More sensible is the D600 or D800. Full frame cameras used with FX lenses (lenses for full frame cameras) should give you higher resolution because of the larger sensor and more megapixels. (If I had the money this is where I would go).
I'm sure that the D5100 will produce perfectly decent results, but if you are considering an upgrade now, then do it. You will probably regret it if you don't. If you have the funds, i would go for a good spec DSLR and some good glass.
I'm a Nikon user, so I'd say stay with Nikon, although plenty of others will advise Canon, or maybe even something else.
These are just my thoughts, but I hope this is of some help.
Chris
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