Civic EG

Im trying to get a turbo kit for my 94 eg and i wanna put on a turbo kit .... does anyone recommend me changing the pistons first.....? and also where can i get one for decent price..

Its always recommended that up upgrade the pistons, all internals actually. The engine wasn't designed for boost...yes you can boost it stock. In the long run building your engine for it will benefit you. Especially when you want more boost, which you will after a while.

If boosting stock there is a lot you want to take into consideration.
how many miles are on it? were they hard miles (racing, taking to 7k RPM's alot)? how much boost are you running? is this your DD? looking for any specific numbers?
Also you want to do a compression check too.

IMO, the best priced quality kit is the treadstone...

http://www.treadstoneperformance.com/product.phtml?p=23&cat_key=134&prodname=Honda+Civic+SI%2C+B%2C+D%2C+CRX+Series+Turbo+Kit

Define decent price. If you want a good d-series turbo kit I'd check out go-autoworks.com. There customer service is great, and you can get a kit custom tailored to your needs. The kits are really good quality and Greg is really knowledgeable and will help you figure out what will fit your needs best.