Anything that is a good investment but not tax efficient should go into a Roth, IMHO. If you put it into a traditional IRA you may end up with something that currently might throw off a 15-25% taxable load (short and long term CGs, dividends, interest, etc) into a vehicle that you might end up paying 35-?% in the future. At least at this point, the Roth will negate all of that damage if you can afford the up front tax on the original investment.
"Good judgment comes from experience. Experience comes from bad judgement." - Will Rogers
DW and I - FIREd at 50 (7/06), living off assets