You could be ok with 250...
However with this cycle I would run 500iu twice a week for five weeks - take one week off - then repeat.
If I'm injecting test twice a week - I would do your Human Chorionic Gonadotropin (HCG) the day before your test injections.
As far as your questions about Letro and Aromasin - everyones posts are spot on - the only thing I'll add is - Z currently has a pole on his site, asking about what his customers would prefer - Aromasin being one of the items.
So he might be getting it in the future, I haven't personally asked him ... but I hope he dose get it.