If you have the money, in your position I'd be inclined to buy a hybrid or cyclocross bike. Put the money you save on not having old trusty serviced towards it.
Then whilst you are trundling around all happy on your new machine, you can take the other off the road, overhaul it yourself, in your own time as funds dictated.
Then you have the best of many worlds; new bike to play with an older bike you can use for general use / pub runs and when you get back from riding your new bike you have a bit of fixing and modding of your old bike to look forward to.
Then whilst you are trundling around all happy on your new machine, you can take the other off the road, overhaul it yourself, in your own time as funds dictated.
Then you have the best of many worlds; new bike to play with an older bike you can use for general use / pub runs and when you get back from riding your new bike you have a bit of fixing and modding of your old bike to look forward to.