The 1.4 version is updated very regular so as I said most of the current ROM's should work OK. Not to sure if YSMENU will work but the DSTT option is also good as Pong, Retro and all the others on that link update very very regular.
If you do want to install the DSTT verison then download the files form the link and copy the four TT ones onto your SD card - do not copy the other three files as these are for the non 1.4 R4i-SDHC.
When you go to select a game you should then also see a TTMenu.nds file in the list. Open this and it should bring up the TT software and then load your games from there. You can also edit the text in the file called 'multimedia_path' in the R4iMenu folder to TTMENU.nds so you can just press the multimedia button from the main R4i screen provided you are not going to use Moonshell.