The .63 housing is kinda big for the street on a 1.8 with a power goal of 300. The exhaust housing will swap out with a brand name turbo, so long as the stages are the same, if you wanted to run a .48, which would meet your goal of 300 and give you better responce for the street, then you could swap housings out again as you power goals went up. Ebay wonderspool turbos work, but it's a knock off of an older design most notably the turbine wheel. They spool quick(er) but strugle up top compared to newer turbine designs because they use more blades.

I ran a restrictor for 7,000 miles on an Ebay wonderspool before I upgraded the turbo. The "filter" that comes screwed into all new Turbonetics turbos, guess what, it also acts as a restrictor.