wow, amazingly your choice is exactly same as mine. Well, samsung B-30 series is relatively new monitor, whereas Dell st2410 is a half-year-old product.
samsung: reputable for product quality, but have backlight problem (recent year the quality has dropped and the price u pay is for the brand, coincidentally samsung boss said the latter part himself), has calibration software.
dell: reputable for after-sales-service, has what we call the legendary rma service quality status lol.., but panel might not be as good as samsung, less brightness than B2330H,
This is what i might do, I'll go pc fair to find out whether Samsung got offer or not (lowest i see for B2330H is rm619), if it gets lower, then I might consider it. As for Dell, it has promotion till 25th April, so I think i have plenty of time to ditch Samsung for Dell (the price from website is rm679, but if you're a regular customer, ask for discount).
Yes, both monitor doesn't come with USB. anyway y u need usb port when ur CPU should have the port as well?
I set my brightness to 0 and Contrast to 70. This is my best setting for my Dell ST2410.