Which flat bar bike

I don't know where to start. Any advice appreciated!
I currently commute around 70 miles a week in the city on a Specialised Vienna Globe which is 5yrs old. I would like something lighter, faster etc for commuting and longer charity rides. Budget £700. I'm 5"3, female. Can only use flat bar's due to a wrist problem. Any idea where to start. Is it worth building my own (I have no experience but willing to give it a go).
I currently commute around 70 miles a week in the city on a Specialised Vienna Globe which is 5yrs old. I would like something lighter, faster etc for commuting and longer charity rides. Budget £700. I'm 5"3, female. Can only use flat bar's due to a wrist problem. Any idea where to start. Is it worth building my own (I have no experience but willing to give it a go).

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Oddly though I find my hands and wrists more comfortable on my road bike due to the increased positions available.
Rose Xeon RS
The Boardman hybrid is worth a look too, and they do a female-fit version if that suits better.
Cheers,
MarkP
Tibia plateau fracture - the rehab continues!
There are plenty of flat bars these days - just have a browse on, say, Evans website.
You get more for your money with the Boardman. Don't let the anti Halfords rubbish put you off, its only sold by them (after allegedly doing a pre-sales check) and Boardman head of R+D is Boardman himself (can you think of any one more qualified - thank you for GB Team). The two top models Hybrid comp and hybrid pro comp are really good. The 28c standard tyre will handle both fast road and commute and the discs will stop you in the rain. Don't get caught up in the "female bike size" thing. Both have quite low frames and if the handlebars are too long a reach, a new short stem for £15 will sort that out. The Specialized Sirrus is on sale in most bike shops now. Like all Specialized, great build quality but you pay extra for the name and definitely get less kit for the same price as the Boardman (But like I said, a big sale now on with Specialized). Building bikes is great fun, but such an important build may be a bit too much.
Hong Kong Phoey - Quicker than the human eye!
Not enough: bikes, garage space or time.
At 10kg, I don't know how MrsP's Vita compares to the competition, but that sounds reasonably light to me, and I certainly wouldn't call it heavy.
Cheers,
MarkP
Tibia plateau fracture - the rehab continues!