Worth looking at pre-DPF chain cam Kia Cee'd and Hyundai i30 1.6 CRDi SW, but no guarantees they're in this price bracket. Anything with a timing belt probably needs a new one and a new timing belt, tensioner, waterpump and alternator belt starts at £360, but could easily set you back £600.
The early models with the 5 speed gearbox are known to have a notchy gear change. I changed the gear oil on mine, it improved the gear change a lot, but that was at 150.000 km. i40 CRDi 100 kW 2013. Jason Jones. 1st Gear.
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