Theyre fairly good speakers but for that money you should have gone for the B&W 601S2's or S3's as someone mentioned above, you could possibly get a set of B&W 602 S2's for not much more... Anyways youve got them now so...
I'd say a good amp for them would be either the Rotel RA04 or the NAD C320BEE. Id personally avoid the Marantz as to me they sound a little too clinical and not very good bass weight with B&W speakers.
You've obviously got them 2nd hand so youre ok with buying that way; Take a look at eBay for decent Arcam Alpha 8 or 9 integrated amps as well. Not sure on your budget but theyre good and are well matched for B&W speakers.
The QED Silver Anniversay cable will be more than good enough but for the same £££ you could also possibly look at the Chord Carnival Silver.
What CD player have you got for the system and waht music do you listen to? Also, have you bought speakers stands for them or are you mounting them differently?