here you go.

And the best parties are thrown by SAE, Chi Psi and Sigma Chi

I'd say Beta (frats don't like them but girls do) and Lambda chi are above phi kappa because i never hear about them. The old southern fraternities (SAE/KA/SNu/Sigma Chi) are extremely exclusive, rich, and some of the best chapters in the country, well above the rest although greek life in general here is better than just about anywhere else.

Top: SAE/ Sigma Chi
Lower Top: SNu/Kappa Sig/KA
Upper Middle; Pi Kapp/ Chi Psi
Middle: Beta/Pike/ Phi Sig
Lower Middle: LXA/ Phi Kapp/ ATO (getting back)
These are the only ones that matter

only frats that matter:
Sae/Sigma Chi/ KA
Kappa Sigma/ Snu
Pi Kapp/Chi Psi
Phi Sig/Pike/ Beta
LXA/Phi Kapp
ATO/DTD

SAE Sigma Chi KA
Sigma Nu Kappa Sig
Pike Chi Psi Pi Kapp ATO
Beta Phi Sig AEPi
DTD Lambda Chi
Phi Kapp TKE Sig Ep

based on parties and pledge classes

There's a clear top 5, and while they are all very good, its still pretty easy to order them, although a little bit is off of personal opinion.
Accounting for parties and social atmosphere, money, house, and exclusivity. Sepearated into tiers:

SAE
Sigma Chi
Sigma Nu
KA (falling passed couple semesters)
Kappa Sigma

Pi Kapp
Chi Psi

Pike/Beta
Phi Sig

Lambda Chi
ATO
Sig Ep

AEPi
DTD
Phi Kapp
TDX
Du
TKE

Not saying this is right just my perspective. Left to right=Good to Bad

TOP TIER
Southern: KA, SigNu, SAE
Mostly Southern: Kappa Sig, Sigma Chi
Mix Southern and Northern: Pi Kapp
Northern: Chi Psi, Pike (almost middle)

Middle: Phi Sig, Beta, AEPi

Bottom: DTD, Lambda, Phi Kapp, ATO

Very Bottom: Sig Ep, TKE, DU, TDX

top
KA (Falling), SNU, SAE(falling), SIG CHI,KSIG
upper middle
PI KAP, CHI PSI, PIKE
middle
PHI SIG, AEPI, BETA
bottom
everyone else