6.5" Splits, or 6" Coaxial and 4" Coxial Door Speakers?

[Max1636]

Currently in my Golf I've got 4" Alpine Type S speakers in the dash and Kicker 11KS60 in the door panel.

Although the setup sounds good I've considered insted getting a pair of 6.5" Focal Splits, listed here on eBay:

(Yes, does seem risky but I plan to communicate with the seller to see if the speakers are genuine)

http://www.ebay.com.au/itm/150783172159?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649

Would this pair of speakers sound better than the Alpine and Kickers together?

It would also make my amplifier situation a bit easier, since I will only need the one amp for the one set.

Rather than bi-amping each pair of speakers seperately.