You might be able to pick up a male bumblebee for that kind of cash. Haven't priced them lately, but I know they've dropped quite a bit.
Out of that list, I'd got with the pastave. The others would require you to hold back all the females as 50% possible hets to breed to dad and try to prove them out.
You could always pick up a baby female spider (or bumblebee) for him on down the road, and make some nice combos there too.