soundcards:
[$n/a]ALC889 - the minimum onboard soundcard i can recommend, it rivals Asus Xonar DG/X in terms of sound quality.
[$n/a]ALC898 - formerly the highest quality on an onboard soundcard you can find, its nearly equals that of Asus Xonar DSX in terms of sound quality.
[$n/a]ALC1150 - the epitome of quality on an onboard soundcard, its nearly equals that of Asus Xonar DX in terms of sound quality.
[$39.99]
Asus Xonar DG/X (DG[PCI] or DGX[PCI-E]) - cheapest possible soundcard you can get, minimum soundcard i can recommend.
[$59.99]
Asus Xonar DSX - a cut-down version of the DX, its one of the best budget cards out there.
[$77.99]
Asus Xonar DX - the epitome of budget cards, i have this one and its quite a good card, the only qualms i have is Asus's shitty drivers.
[$169.99]
ASUS Xonar Essence STX - milder variant of the Xonar ST.
[$199.99]
ASUS Xonar Essence ST - it is the epitome of quality/price of soundcards, based on reviews its even better than Asus STX. anything noticably better than this is retardedly expensive(over $400).
headphones:
[$54.99]
Superlux HD668B - cheapest "quality" headphone you may find, well at least on my area.
[$89.30]
AKG K142HD Studio High Definition Semi-Open Headphones - i've heard of good things about this headphone, although i haven't tried it yet...
[$121.98]
Audio-Technica ATH-M50 - its quite a popular mention in head-fi.org, so might as well put it here.
[$132.82]
Audio Technica ATH-A700X - quite a popular suggested "neutral headphones".
[$179.99]
Shure SRH840 - its the most suggested "neutral headphones", i've heard of it once from an open showroom, i would've bought one if it was $100 cheaper.
comparison between Superlux HD668B is that this one sounded more consistent, or more like i don't need to move the headphone around my head as much as with superlux to find the sweet spot.
[$184.25]
Beyerdynamic DT 770 PRO, 250 ohms its one of the top shelf headphones, go figure.
[$194.00]
Audio Technica ATH-AD900 its one of the top shelf headphones, go figure.
[$209.00]
Beyerdynamic DT 990 PRO - its one of the top shelf headphones, go figure.
notes:
you might wanna get some of the following opamps below and swap the stock opamps on the soundcards, then find which you like most.
ad823 - (free sample?)
AD8397 - (free sample)
AD8620 - (free sample)
OPA2132P - (free sample)
OPA2277 - (free sample)
[$141.75]
Burson HD Dual Opamp (8 Pin DIP socket) - best opamp that i know, be warned that it's insanely expensive...