I found this too. wanted one till i actually looked around it, very inpractical. cant use the back seats unless you have no legs. so its a 2 seater really. for that i would go for much better cars. and the lack of turbo otion is a real shitter, but then its fairly easy to do an STI engine swap.
This was going to be my sensible set up from my celica. decided to keep the celica, which is now becoming my track car. and use my Evo now as a daily. 4 doors and good sized boot, very practical, and tons of power. dont say much for economy, but then thats not why you buy an evo! haha.
At the end of the day, its obviously up to you. personally id keep the celica, and find a better car down the line.