Spend the money and get a prof… oh, wait. You already thought of that!
Ok, well, simple answer is that any square taper cranks will fit. In terms of what are the best ones, that depends on what you are planning on doing with them. Ali are lighter than steel, but more expensive. Steel is stronger though.
If you’re only planning on getting them ‘to try them out’ then I’d just get the cheapest set of Steel ones. Unless you plan on giving your hub a realy beating (could be, as you’re alredy thinking of going splined), then they should be more than up to the job.
Amazon.com has Torker LX aluminum cranks in a variety of sizes for around $15 plus shipping. That’s pretty reasonable, and people tell me that the cranks are quite strong (probably significantly stronger than the Suzue hub).
The thing to worry about with square taper hubs is that the more you remove and install them, the more likely you are to begin rounding off the edges, which will then put some slop into the crank/hub interface.