Ride my Allez into the ground or N+1, What would BR do???

I'm riding a fairly basic Specialized Allez, 2013 with upgraded Tiagra drive train and a Fulcrum racing 5 wheelset as pictured here (in non-OCD pose)

Its in very good condition and well maintained, wheels run nice a true and fits me quite well.
I have a smallish budget of £600 which could be stretched if I needed to by a few hundred and have seen this Spesh Tarmac Sport on ebay...
http://www.ebay.co.uk/itm/2013-speciali ... 43d83c720a
The question is, for the amount that it may go for am I basicaly side stepping or upgrading, yes the Tarmac has a 105 groupset but are the wheels a downgrade etc?
Other option is that I gradualy add to by meager budget and ride the Allez for this year and upgrade in 2016.

Its in very good condition and well maintained, wheels run nice a true and fits me quite well.
I have a smallish budget of £600 which could be stretched if I needed to by a few hundred and have seen this Spesh Tarmac Sport on ebay...
http://www.ebay.co.uk/itm/2013-speciali ... 43d83c720a
The question is, for the amount that it may go for am I basicaly side stepping or upgrading, yes the Tarmac has a 105 groupset but are the wheels a downgrade etc?
Other option is that I gradualy add to by meager budget and ride the Allez for this year and upgrade in 2016.
Advocate of disc brakes.
0
Posts
IMHO both bikes are worth at least the FR5 wheels - or better.
The Allez is a fine frame (although the lack of mudguard clearance is a pain for running as a winter bike) and can be used from winter duties to racing in all its forms and everything in between.
I can see the appeal of buying a £600 tarmac- it would be marginally lighter and may offer a little more comfort and performance from the frame but the finishing kit and wheels are not much different to what you have already, and you will still need to do a bit of servicing to get it working properly.
However, if you are looking at an investment frame that you can upgrade over time (e.g. buy shiny Ultegra groupset to put on the Tarmac and then move the old 105 from the Tarmac to the Allez) and have a shiny pair of summer wheels on it when it's not a bad buy.
There is also the peril of buying a new bike and then building up an argument for keeping the existing one for winter travels, etc. Before long you could end up with a fleet of them!!
Peter
£799 !
Or if you have £600 finance another £400 and you'll have the pick of loads more and it's not too bigger financial impact.
I think my ideal scenario is to ride the Allez and if funds increase over the year maybe buy a 2015 model in the end of year clearout. I just hate looking at ebay with cash sat doing nothing.
I am considering discs though, and thats one of the sticking points with buying now...
Downside to that is the bikes are porrly specced to fund the brakes...
"The Tarmac Sport is a pure and unbridled race machine. It climbs effortlessly, descends confidently, and sprints ferociously. Bottom line, you’ll be faster on this bike."
All according to the Spesh BS machine
Christ, just swing a leg over and off you will fly...
On a more serious note, I would save a bit more and look at a better spec Tarmac. I am a big fan of the Allez though and ride one with the E5 frame, which is very good and exceptional light.
If you prefer Sram - the 22 levers are ace.