The former England defender does, however, believe fans will be sorry to see Glenn Murray leave after he joined Bournemouth.
Manager Alan Pardew had a busy summer as he brought in several fresh faces to supplement his squad, although it was the signing of one man that caught the eye of many.
That was the capture of Yohan Cabaye from Paris St Germain, with the midfielder widely considered to be one of the biggest coups of the window as many top clubs have been linked with his services in the not too distant past.
And Keown says it is hard to look past Palace when considering which team carried out the best business.
“When looking at every club’s transfer business I try to look at which starting XI are affected the most and this summer it’s been hard to look beyond Palace,” he wrote in the Daily Mail.
“Yohan Cabaye, Alex McCarthy, Connor Wickham and Bakary Sako have all come in and had an immediate impact on the first team. Yohan Cabaye is a top player and was a real coup, and Sako has been in the goals. Patrick Bamford is also another talented young player to have on loan.”
Sad to see Murray leave for Bournemouth
One player who has left the club is striker Glenn Murray, with the 31-year-old completing a move to newly-promoted Bournemouth.
Many Palace fans will be sad to see him leave given his impressive goal scoring feats during their successful 2012/13 Championship campaign which saw them return to the Premier League.
He has found himself further down the pecking order under Alan Pardew, though, making a move elsewhere likely, and while Keown says he will be missed, on the evidence so far it looks like the club have got excellent value for money.
“Fans will be sad to see Glenn Murray leave after his goal scoring exploits in their promotion season,” he added.
“But he has always been a bit of an in-and-out player for Alan Pardew. For a club of Palace’s size there has been significant investment. On the evidence so far it looks like they have got excellent value for money.”