Ahah, this is fun, and since I am knowing about this contest right now, I could read all the guesses and make up my mind, so here are my 10 guesses, my friend <3:

1. 263
2. 274
3. 302
4. 297
5. 253
6. 291
7. 312
8. 285
9. 315
10. 244

Cheers to all! This is really fun!