Didn't this question was asked not long ago?
I remember i replied when it comes to PSE or GFE it depend on the mood i am in, and the girl i book with. Booking a pornstar i will expect a PSE encounter, if i book a GFE that have a reputation for cuddling and tenderness, i will expect more of this.
As for services, CIM or COF is definately a big big plus(and a girl can be totally GFE and still offer CIM), its pretty rare i book girls that don't offer it. I do sometimes, last one was Alexis at GG, i tough she was extremely hot at the GG3 party, she was recommanded to me before too, so i decided to book her and i was not disapointed despite knowing she was not offering it. But its a different thing i guess because i was able to saw her in person, knowing exactly what she looked like including the face.
If my budget was bigger, it could be different, but considering i have more or less 12 to 15 escort meeting a year(including the repeats) , i can't see everybody i would like to see. So if she offer CIM she usually goes highter on he list than the one that don't... And to change that the girl in question need to be EXTREMELY hot. Maybe i am a bit spoiled since those GG parties, but i rarely base my choice on pictures anymore. Its so much better to meet them in person and get the complete look at the girl as well as the vibe she got. I think every agency should definately organize there own parties from time to time, but i am aware they don't have somebody like Iggy who spent so much time and put passion into it to organize them.