If its just a commuter why spend 5k on it?
I've recently got rid of a 1996 306 XRDT which gave fantastic economy, has enough room in the back for bags, and cost £450 to buy and buttons to insure and maintain
I've replaced it with a late 2003 Volvo S60 D5. Paid 2.5k, insurance is still cheap, economy is 56MPG average (I managed a 63MPG run to Waddington from Brize and back) Reliable, very comfy and a great stereo
I considered when getting the volvo going for a mk3 mondeo (Loads available for a lot less than 2.5K (2003 ish))
also considered very late nineties Passat 1.9 TDIs, (can get them for little more than 1K)
Clio 1.5 DCIs (2002 ish) are incredibly economical but can cost more to buy than a mondeo TDCI of the same age...You have to think about how you want to spend your money, on a car that will give you the cheapest A-B option, or the most reliability per £, or the best all rounder per £. and on the latter note, it has to be the Mk3 mondeo TDCI (But dont spend 5k on one, get a 2K one and spend the 3K on keeping said car fuelled, taxed, maintained and insured for many moons)