You have to look at these things as a long term investment. What's the 'cost' of not going for the higher spec? A DRO saves time so if used commercially will boost productivity. Even in hobby terms 'time' has a value. I'd add a QCTP in that category too. IMHO having all your toolbits pre-aligned is a big time saver as well as potentially avoiding costly errors. £600 more over the life of the machine is <£60 a year. Unless you're using a payday lender to fund the purchase the additional cost is far cheaper than the return on any 'savings' you make.