Cervélo R3 buying advice

I'm considering buying a new bike (beloved Diamondback Di2 got stolen). There are so many excellent bikes out there to be bought, I don't want to be stuck in an endless dilemma. After much reading, I thought it would be a good idea to go for a Cervélo R3 2015 (the black/blue one). I can get it for 1700£ in Ultegra, or 2300£ with Ultra Di2. Still deciding whether to go Di2 again, or mechanical + better wheels (DA C24 maybe), since the Fulcrum it comes with a pretty heavy. Can someone comment on this bike? I know it's supposed to be excellent, but more opinions from actual long-term users wouldn't hurt.
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Almost the perfect all rounder? yes - I think the R5 may be better, as it has the same geometry and is a little lighter. But an R3 for £1700? bargain.
I'm very, very happy with mine, and I think it's my favourite bike. Don't forget I'm only a bloke on the internet.
Andy.
Personally i would go for ultegra 11 and then treat it to some nice wheels
same as Andcp I'm just a regular rider,but iv'e got the feeling of kid with a new toy with it at the moment
are you running 25's at the moment,as i am just debating whether to buy some or stay with 23's
+1
Is that price from a UK retailer?
Sounds a steal.