Welcome... so what kind of dsm would you like to own? do you want to start with a highway racer, fwd turbo platform and build that up(GST)? or a drag car, all wheel drive turbo platform (GSX), or are you looking to be original and build everything custom from ground up, by starting off with a base model, RS, or GS, non turbo, fwd car and boosting it in the future? If you do buy a GST/GSX it would be nice to find one that already has the 6bolt 4g63 swap in it, as long as its installed correctly. because if you buy one with a 7bolt 4g63 in it, and you start modding, your gonna get some serious crank walk. and If you decide to buy one that is non turboed, make sure you buy a spare head gasket.... lol. good luck finding/buying a DSM, i hope it all works out for you!
oh yea, i almost forgot....
Invest in some tools.... your gonna need them.