Xecuer 3 is the newer chip from team xecuter
both are great chips and both work on a 1.0 xbox, i have an xecuter 3 on my 1.0 xbox and love it.
personlly i would go with the Xecuter 3 Pro but you can go with the CE if you wnat to. i also perfer to solder it on there but the solderless adapter will work on you 1.0 too so its really your choice
if you dont know how to solder i would take it to a pro so you dont f**k your mobo up, if you cant find a pro then get the xapter.
soldering should be the least of your worries, wait until you have to get a BIOS and a Dash Board it gets alittle frustrating but there are some awsome tutorials on X-S