New Car??

Here's the deal......My car is a 2000 Honda Civic EX and it has 98,000 miles on it. It still runs ok, but it is getting to the point where it might be time to let her go. I went to Lucas Honda here in Jacksonville and looked for new and used cars. They didn't have any used 5 speed EX's or any new ones. They did have the 2005 Honda Civic Si. It is a 5 speed with 167 horsepower. The Civic Ex has 127 hp. The Si gets 29 city and 31 hwy. Not too shabby. It is a hatchback, which is not that appealing to my eye, but with some rims and tires it might not look too bad. One problem with it is the hatchback in itself. With the car I have now, if someone breaks into it they cannot steal my speakers because of the trunk lock that can only be opened with a key. The hatch does not have that luxury...and we all know how people like to take my shit. The good thing about the hatch is that the sound of quality speakers is enhanced by the lack of a trunk rattling and interfearing with the sound. My car is worth about how much I owe on it and I can get a payment around the same as what I am paying now. So, the question is new car...or paid off car in about a year and a half...??? What to do?