Hi Wiskas or is it Wiska's, a first name would be easier
DX extreme is a popular spot, here's a link that will get you to a myriad of LED's for 12v at very good prices
http://dx.com/s/12v+led+light as mentioned before, I'd recommend cool white for areas you need to see like bench tops etc but warm white every where else to keep the mozzies out.
These are a stand out for replacing those low profile down lights
http://dx.com/p/2w-9-smd-led-126-lumen- ... -12v-51001 Solder a bit of the long legs back on themselves to make the pins thicker for plugging in the socket may help along with a bit of Blu Tack to mount it just where you want in the light holder. Another option is remove the pins and solder wires they can also be soldered on to tabs on top of the heat sink backing plate. They can also be mounted with blu tack or double side tap in the body section where the fluro tubes were, then replace the diffuser cover, try a few and see just how many you need to look right and give the light needed. Don't for a minute think you need twice as many because they are only LED lights, they are bright.
These are great if you have the room for normal halogen 12v down lights
http://dx.com/p/high-powered-3w-12v-led ... t-60o-3264 they are available in warm white as well. Two of these in our 2.5mtr square white walled bathroom make it like a near death experience so I'll be trying one of these dimmers out
http://dx.com/p/dimming-controller-for- ... -12v-73618 hopefully I can bury it in a wall cavity with a standard light switch cover over it.
these strips and others like them are good for lights under a bench or in a cupboard or the replace the long fluro tubes
http://dx.com/p/3528-5w-75-led-380-lume ... 50cm-33059 they can be cut into shorter lengths, a bit of soldering, add some wire and the cut bit can be used some where else. they are marked where to cut them, 3 led's at a time, any shorter and they don't work.
Just some ideas, they are cheap enough to experiment with to see what works for you.
A tip, order each lot separately, if you do it in one bundle and any are on back order you won't get anything till the order is filled, postage is free so....
T1 Terry