In order to fix the crankwalking problem you're going to have to get your crank resurfaced. If it hasn't scarred up the block yet you're lucky. You can pick up a set of used 300ZTT turbos off of ebay for not too much. It's better to either go with a larger turbo, or stick with the stock ones. If you switch to another brand (Saab, Volvo, or whatever) you're going to have issues with the clearence. HKS has an awesome setup that utilizes the TD-05 and it's not too expensive. Or you should look into getting some rebuilds from Garrett. Another place you can look is the twinturbo.net classifieds, stock turbos go for hella cheap all the time there. The stock turbos are good for 12-14 psi when properly tuned. Get a boost controller and you should be golden when it comes to a properly running Z.