The following cards all compatible all version of ds :

The Acekard 2i is cheap and one of the top cards in game compatibility and update speed. However, you will need to have a DS/Lite or a DSi with firmware 1.3 or lower in order to update it to work on the DSi's 1.4 firmware (which the DSi XL comes with).

And for the R4i sdhc , it has great support and also a games engine where u can download games right off of the DS itself .

So if you want to use r4i for dsi 1.4 directly , you can choose R4i sdhc. My friend has recommended this site and told the resent promotion was very attractive ,buy one r4i get one free $12.99

R4i SDHC (RED package) is the best R4i card for DSi XL,recommend you buy it from http://www.ebuylife.com/ Only USD10.50 ,free shipping.

You can buy DS and all gadgets here http://goo.gl/Ge4UZz

go here and you'll see which would be best 4 u

http://www.r4ds-r4i.com/