I'm on the hunt for a power upgrade for my daily driver.
Doing some research on my car insurance for when it's up for renewal I have discovered that I could insure a mk4 GTI, specifically a 1.8T with 150hp, for roughly the same as I'm insuring my 1.4 75hp (exciting) mk5. If I kept the mk5 my insurance premium would drop ~€300 a year but since I can still afford the current insurance rate loosing the price drop isn't that big a deal. A mk5 GTI would be awesome but it out of sight for a long time due to both purchase price and huge insurance costs.
With the money from the mk5 sale I'd have enough to get a mk4 GTI that is in good condition with a solid 1-2 grand minumum left over for upgrades/maintanence. Fuel costs would be about the same since the mk5 is too heavy for the 1.4 engine to be fuel efficient. Hell, might even gain a few mpg

Tax cost would be a small bit higher, but not by much.
In terms of build quality the mk4 is pretty solidly built and I've driven one before and it was nice. The mk5 interior is nicer (imo anyway). Exterior looks are both good imo, though the ladies seem to love the mk5. Mk5 has a higher safety rating, though the mk4 ain't bad either. In terms of power and fun though there is no comparison, the mk4 GTI will blow the small engined out of the water.
If I go for it and everything goes disasterously wrong with the mk4 and it gets stuck on the driveway waiting for repairs I still have my Vento hibernating safely at my Dad's place so I wouldn't be without a car.
Before anyone suggests a TDI of some kind for a power upgrade without the insurance cost rising, mk4 and mk5 TDIs are blacklisted here for insurance and have big insurance loadings because of all the chavs crashing them. Alternatively an Audi A3 with the same engine would cost less than the mk4 GTI on insurance, but there are basically none around.
So, is it a stupid idea to buy a car 4-6 years older than my current one or does it make some kind of sense?
Too long won't read: Is it a stupid idea to sell my 1.4 mk5 to buy a 1.8T mk4?