I also have a '94 RT but kinda like the doors. No one knows how to get in! I love telling people "sure you can have a ride if you can figure out how to get in". It just makes it feel more like a race car.

Anyway, couple minor and fairly inexpensive things you could consider to enhance the car:

1. MGW shift knobs and AC controls make it look a little jazzier inside and help shifting by making it a shorter throw. See www.mgwltd.com . George is a great guy there and can help you out.
2. For a little extra power consider changing the air filters to K&N and replace the wrinkled air intake tubes and air box (thing below them) with straight tubes. That's pretty much everyone's first modification.
3. For better sound out of the stereo, replace the 6.5 speakers and enclosure between the seats.

There is a million things you can do and others will probably give you better ideas, but that's a start!