I would suggest you not install any if you love the device... Most hacks come with a side effect that some users do not understand.

Having a clean stable device is a wonderful thing. I think the best post I saw was from someone who installed a whole pile of stuff from a list.. I think he installed everything... His PPC was locking up all the time and he did a hard reset.. Realised it was WAY faster without all the junk.

Hacks are for working around problems you have with the device, if you don't have any problems, don't instal the hacks because someone else thinks it is great.