I recommend the PS export or directly as PDF.
Then convert in PS to target color space. From Acrobat, Pro only, export as image and select CMYK with profile.
The export from Xara as CMYK-TIFF moves colors and ignores overlays with transparencies.

layout in Xara
Click image for larger version. 

Name:	xara.jpg 
Views:	93 
Size:	144.4 KB 
ID:	123810

exportet TIFF from Xara in Photoshop
Click image for larger version. 

Name:	tiff-ps.jpg 
Views:	96 
Size:	92.2 KB 
ID:	123811

PDF in Acrobat
Click image for larger version. 

Name:	acrobat.jpg 
Views:	96 
Size:	95.0 KB 
ID:	123812

PSD from Xara converting to CMYK color space
Click image for larger version. 

Name:	ps.jpg 
Views:	98 
Size:	88.3 KB 
ID:	123813