Should I keep it or dump it?

I have had my range rover hse 2006 since 2008. It is paid off but has 142k on it. I know I live in the burbs and commute in to the city for work. This last year I have shelled out about 12,000 for maintenance and repairs. The last 2 months have been a nightmare. Christmas eve the suspension went. What I didnt know is how awful the diagnostics on this truck is. So they have been fixing one thing after the other and as soon as I pick it up the suspension drops again. It has been in the shop for 2 months and I picked it up today crossing my fingers that nothing else goes wrong. My husband and I bought a house in December and my student loans come out of deferment next month. The last thing I want to do is buy another car. I am just afraid something else will go wrong. However, I need a vehicle for work. Should I keep it or dump it and get something else? I was thinking of going back to mercedes eclass 4matic  (we have an earlier version 2003 that is paid off and reliable) because there is a special of 4 years and unlimited miles of maintenance and 2 months of free car payment. I'm just worried I am going to be dumping more unforeseeable amounts of hard earned money into this lemon. What do you think?