Just so you know, there is no "with or without t-tops" option. In fact - there are no t-tops.
the del sol has a "targa" top like Porsche 911s or Toyota Supras. Maybe other cars too...the top comes clean off, no "T" like a Camaro or 300ZX.
Also, every del sol is this way - there is no solid-top coupe... they're all semi-convertibles.
If you went for the older years, 92-94, you probably won't pay over $4-5000 for a car with 75-100K on it. For the later years, 95-97, I would expect the price to vary with the mileage and whatnot.
Good luck!