I would guess that an Ellis Mountain motor would be nice...it looks like the only one that might be able to lift it would be the I154, but then you'll seriously be pushing it. I'd say find someone with a LEUP to buy you the motor and then assemble it with you.
I guess i'm kind of brain dead a little bit, i hear SU and automatically assume AeroTech, there's alot more out there.. the Ellis stuff, maybe some CTI loads too would suit ya but they would need hardware..
Until the ATFE NPRM passes LEUPs are not required to purchase reloads with less than 62.5 grams per slug. This includes all AT and CTI 38mm loads.
Contact the club you will be flying with and I am sure they can find somebody to loan/rent some hardware for either company. I know our club will loan out hardware for cert flights at no charge, assuming it is not destroyed.
Reloads will save you a few bucks and are easy to assemble. If you are a little worried ask one of the members to watch and make sure you are doing it right, we/they want you to succeed.