For the first link, The Case is ok, the PSU is ok as it has decent amp rating on the 12v rail, the RAM/Motherboard/CPU are great and the hard drive is on the slow-ish side as it is 5900 RPM. But all for 558.00, that's not too bad... Can use the hard drive as a data-storage hard drive, the case is decent if you want a new case, the power supply will work... I would say all in all, that is a decent deal...
For the second link is basicaly the same items except for the case which is a little better and the motherboard which is a little better, but i would think that the first link has the better deal.
i have been reading into motherboards just recently and it seems like a few months ago p55 chipset was prefered over h55/57 although recently it seems that most people seem to accept h55 now for its price/performance
will the cpu or graphics card be bottlenecked in any way using h55 over p55?