I recommend 1 of 3 options:
Get the EK S240. It's aluminium, so you CANNOT mix metals and have to be careful when shopping but it should be fine to expand in the future. The quality is not an issue. If you do want to do your GPU as well (I know you said you didn't but may as well let you know that it's there) theres the S240G and if you really want to pinch pennies there is the S120, although the S240 is much better value. There is also the S360 but if you are just cooling a cpu the 240 will do fine.
Get the EK L240. Pretty much the same as the S240 but with copper blocks so you dont have to fret about mixing metals. This wont really get you much performance increase from the S240 and it does cost more.
Get a monster air cooler like the NHD15. This will do just as good of a job as an AIO or even a small custom loop (more or less) and probably will end up being cheaper and less of a headache. Water cooling is still a good option but I recommend you go for a custom loop in a kit or a air cooler. AIOs are not recommended by me. Some people swear by them but I've has way too many failures and found them to be less than impressive in terms of long term use and maintenance and quality of construction.
EDIT: forgot to mention that both custom water cooling kits I mentioned will be fine for hardline but you'll obviously have to replace the fittings.
ANOTHER EDIT: forgot to give links. Listed below: