You wont need the most effective anti-E when using Prop. Prop do not have as many sides as others AAS. The retention levels are low enough to get by with mild anti-e's. I would suggest using 25-50mg of proviron ED. Next would be Arimidex .25mg EOD
The degree of damage to your HDL isn't dramatic enough to cause any permanent/long term damage and the extent to which it will occur will vary from person to person.
Considering his financial concerns, 1 mg Arimidex EOD is a safe bet. If HDL is that much of a concern, 0.5 mgs Arimidex EOD and 10 mgs Nolvadex ED is an alternative.