I have had very good luck with "Aquila Strings" on my ukulele and plan to put some on my classical guitar. The fellow that sells them in this country is very a wonderful person to deal with. All the strings come in 120 cm length so it may be possible to get two sets out of one order. They also sell "Nylgut" which have a sound close to gut (less expensive than gut). The quality is excellent and I would highly recommend these strings. I have had no problem keeping them in tune once they stretch a bit. When I placed my order he had them shipped before I got the check in the mail.
Their website is: http://www.aquilausa.com/Default.html
Cap't Bob