From your tire wear it is obvious you are a hard driver and based on that, your car will require more maintenance than a gentler driver. So be it, it's your money and your car. With the current age and mileage on your 2000 SVT you have already taken most of the depreciation, getting another car at this point will be costly. Equivalent new cars are running in the upper 20k's and low 30k's.
From what you have posted you have no big buck repairs at the moment just a bunch of routine, but not necessarily cheap maintenance. I'd recommend investing in the current maintenance effort and continue driving. I would postpone the decision of replacement until you are faced with a major repair such as a transmission or engine. Given your driving style I'd go for another 2 years and not worry about mileage.
Buying a newer car will (usually) reduce your maintenance requirements but at the expense of a much higher car loan payment or cash upfront. Maintaining a 4 -6 year old car is much less expensive than paying for a newer one. But how much maintenance hassle do you want to live with?
Eric
