Whatever you decide on, please do an extended comparison with your current Pioneer SP-PK52FS speakers, using the same amp and cables.
I am amazed how well the Pioneer Andrew Jones speakers compare to my 9 year old Axiom M80's.
I compared the SP-FS51-LR (first gen AJ floor standing speakers) to my M80's, while my M80's sounded better, I would not have purchased my M80's at their current price, compared to the SP-FS51's.
To make matters even more "unfair", My M80's were passively bi-amp-ed with my Pioneer VSX-1015 (120 watts per channel, THX2 Certified), and the FS51's were powered by a Lepai LP-2020+ with a 12v 6A 3rd party power supply.
I have the bookshelf 2nd Gen AJ speakers (SP-BS22-LR) and they do sound better than the first gen, so I am just assuming that the 2nd gen floor standing speakers will even be better than the 1st gen.
These AJ speakers just amaze me, the sound they put out, for the price is just awesome.
Now if you want something that looks high end, well, you have lots of choices, the Pioneer speakers, while nice looking, cannot compare to the looks of 500-2000 speakers.