I would recommend that you buy a LiteOn LTR-52246S, not for the 52x speed, but because it is a much better drive than the older LTR-48125W.
I have both of these drives, and the recording ability of the LTR-52246S with the latest firmware is far superior to the earlier model, even at 52x. It produces significantly fewer errors, which is important for long term media reliability. It also eliminates a reading bug present in the 48125W when testing burned media for errors. It also eliminates a firmware bug in the 48125W which doesn't allow the overburn capacity of a disc to be measured.
On the site that you posted, the LTR-52246S is only $6 more than the LTR-48125W (which is already an obsolete model). I would strongly advise you to get the newer 52x model, which can be burned at 48x if you wish. I might add, that with high quality media, at 52x the LTR-52246S produces very high quality burns with an extremely low error rate.
The LTR-52246S is identical to the LTR-48246S except for the firmware, so if the 52x speed concerns you a LTR-48246S would be another option. The LTR-52246S and LTR-48246S are also convertible to either model by firmware flashing.