It's threads like this that make me sad my PC died on me along with all the scans I had stored. Google doesn't have everything and it takes too long to find but since Sin says no one here makes an argument for Spider-man I'll take a shot.
Note: I'm not including the many examples of Spider-man putting up fights against character way above his and Ares league and only concentrating on below class 100+ characters. If someone feels that I'm leaving out some sort of context please say so, I'll be happy to address it.
Clobbers Titania
http://www.superherostuff.com/blog/wp-content/uploads/2010/09/secret-wars-spidey2.jpg
Knocks out Griffin (if you're not familiar with this Namor's sparring partner look him up)
http://img268.imageshack.us/img268/2781/img017v.jpg
Demonstrates that his punches are capable of hurting (damaging) the following characters:
- The Thing (It's not in English but art speaks for itself)
http://www.jurnalu.ru/online-reading/comicsonline/avengingspiderman/avengingspiderman014annual01/14
- Ms. Marvel
http://static.comicvine.com/uploads/original/11112/111120556/3230887-image.jpg
- Namor (not the only example but can't find others at the moment)
http://static.comicvine.com/uploads/original/8/80103/3731783-1701491472-33883.jpg
Random punching feats:
- punches Scorpion's jaw clean off (SpOck). The same upgraded Scorpion that beat Titanium Man, tanked Ms. Marvel's attack and a fall from the atmosphere.
http://static.comicvine.com/uploads/original/7/72463/2882335-amazingspiderman700c_scorpion_jaw_broken.jpg
Sends Flash Venom flying head first digging a trench in the pavement and sending cars flying away
http://static.comicvine.com/uploads/original/11111/111119260/3654222-spidey+punching+feat.jpg
Oneshot koes a freaking Trex
http://media.animevice.com/uploads/4/42924/788977-2.jpg
Death head loses his head (SpOck).
http://www.turboimagehost.com/p/15821438/Deaths_head_2.jpg.html
Damages future ironman suit
http://static.comicvine.com/uploads/scale_super/12/125392/2876584-feat19fight4es2.jpg
Damages Civil War Iron Man suit
http://static.comicvine.com/uploads/scale_medium/11111/111116949/3158168-spider+man+destroys+ironman.png
Iron Man suit again (notice bits and pieces flying off)
http://static.comicvine.com/uploads/original/11/118094/3029252-1443330-ironman_vs_spidey_08_super.jpg
Iron Man suit.. again..
http://www.jurnalu.ru/online-reading/comicsonline/amazing/amazing544/19
There's another example with one of the most recent IM armors but can't find it online.
Punches the Digger so hard that the punch generates a shockwave powerful enough to crack pavement in the city above them (Digger was weakened at that point).
http://unicomics.ru/comics/online/amazing-spider-man-495/20
Then there are the fights with Morlun (no, they were not retconed) and many other examples. One out-of-context Absorbing Man scan posted by mistake doesn't take away from all those feats.
All those scans are meant to show that Peter is capable of hurting Ares+ level characters. I will also say that Spider-man is significantly faster than Ares and much more agile. We can compare speed feats if necessary. And his webbing is strong enough to slow Ares down. Again, I can provide feats if necessary. I'm not ready to put numbers on it but all that leads me to believe that this is going to be a decent fight.