Cannondale Synapse 5 2014

Was doing some mooching at the weekend and according to the review 'Lows: You’ll want to start upgrading to make an already great bike into a dream machine' so I'm just wondering (seeing as the review didn't state) which bits should I be upgrading to make it a 'dream machine'? I'm not too serious about upgrading it as I love the way it rides and it's my back up from my mountain bike but i was just wondering really!
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The best upgrade for me was caliper to disc brake. I absolutely hated caliper brakes. Disc made braking a joy and not have to e scared when it's wet and going fast.
Second biggest upgrade for me was tubless tyres. I will never go back to 23 mm thin clinchers. My next size will be 30mm and I can't wait.
Third upgrade. Di2. Absolutely a dream. No more worrying about cable. Maintainous free and accurate adjusting and with impeccable shifting and I get to see my gears on display.
All these three I will not want to be without now.