One of the choices you have to make is on the material of the frame. Carbon Fibre frame bikes are coming down in price and there are currently some good prices to be had on 06 or even 07 bikes. Then there are "Composite" frames that are generally aluminium but with C.F.Chain and seat stays. Then there is aluminium- and although they are a stiffer ride- Not many are as stiff as your Klein. Then there are the Steel frames but these in a lightweight bike are getting hard to find.
Several manufacturers that I can recommend- Bianchi-A great pedigree with a range of bikes to suit all riders and prices. Giant- They make such a large range of bikes- in so many choices of materials- that there must be something to suit you. Then there are so many other manufacturers around that You must be able to find something that will suit your needs. Just look at Specialised-Scott- Trek- or basically any manufacturer.
Looks like you have a lot of Browsing to do but links to Bianchi and Giant below. Only thing is- If you get a Bianchi- Make certain you get it in Celeste Colour- Instant Bling just on the recognition of the colour. The others don't look right.
http://www.bianchiusa.com/07_bicycles.html
http://www.giant-bicycles.com/en-US/bikes/road/