Well, i was looking into ebay and saw this struts Koni Yellow
What do you think about them??? any other options??? i saw the KYB but they didn't make AGX for 6gen only they make the GR-2 and Bilstein makes the black series (OEM)....

Koni makes a great strut. For the Celica though, all four are inserts. On the fronts, there is a nut you remove from the stock strut housing and pull the old insert out, put the new one in. The rears are a little more difficult though. You have to cut the top of the strut housing, pull the old insert and dump the oil out, then put the new insert in. It has a bolt on the bottom that you drill through the housing and bolt it to it, and you probably need to weld the top part of the strut housing back on. With the options available for the Celica, I'd say Koni is probably the best, just takes the most work to install