You say you cant find a decent program .. which have you tried?
Uleads DVD MovieFactory is very affordable , and does what it says on the tin

I dont use it for slideshows , preffering to create them elswhere and import the slideshow as mpeg2 but it does have a slideshow facility
Movie Workshop is better but has been consigned to ver2 for the last 3 years . I dont think Corel ( new owners of Ulead) intend to ressurect it but even at that it is great
Sonys Vegas Family have standalone
DVD Architect Studio also affordable and good if needing a little familiarity
It can be got alone or as part of a Vegas Movie Studio Platinum pack ( although it seems some folk who got it very affordably cant seem to find thiers)
Nero Vision is rather more basic but Ver 4 and 5 ( From Nero 7 and 8) are worth a look if you happen to have Nero on your system