Yamaha DTXpress/DTXplorer/DTXtreme

hello everyone,

its gettin 2 a time with me wanting 2 get more out of my edrummin 
practice sessions. In short, what i am trying to achieve is 2 have 
more pads on the kit with different sounds, essentially creating a 
much more extensive electronic kit, without having to splash out on a 
more advanced brain. I am also trying to accomplish this on a 
students budget (u can stop laughing now) from the UK.In my quest 
(far 2 much zelda as a child, i know...) 2 expand this kit i am 
considering doing one of the following options:

1) buy another secondhand dtxpress(1) full ekit & somehow link the 
brains and rack system (i'll find a way), so that i can essentially 
have one large ekit. i'm not quite sure what this would leave me with 
output wise. if it is not possible 2 link the brains then perhaps 
sendin both of the brains outputs through some kind of mixer or amp 
is a possibility.

2) buy another secondhand brain (probably roland) and buy some cheap 
pads (makin sure that they're all compatable of course) and rack 
system. then doin the same thing as above and sendin the output 
through some kind of mixer again. 

3) buy a dtxreme brain, and hook all of my existing pads & a few new 
ones (if i have any money left!) to it in order to have a much larger 
kit (similar to a basic dtxtreme kit).

from what i have heard and understood about the dtxpress it is 
apparently possible to link 2 identical brains together in order to 
expand the kit, although i have never seen it done it seems quite 
feasable. whether this is a possibility for 2 different brains, is a 
question i was hoping one of u might know the answer 2. this option 
seems much more attractive, mainly due 2 the possibility of having 
many more sounds to play with. the first option however, is much more 
affordable, as the old dtxpress' have depretiated quite a bit, and 
secondhand i'm sure i could pick up a whole kit for a good price. 
naturally, if money wasnt such an issue, i would definately go with 
the third option, not just for the greater expandibility, but more so 
for the greater quality in sound (amoungst other dtxtreme 
superiorities). 

but of course all of this malarky is runnin through my head and i am 
not at all sure whether any of it is possible. so if any of u have 
touched upon any of these issues through your experiences with the 
expandibility of the dtxpress, could u please let me know your 
opinions on what the best way forward would be. any ideas or info 
considering the expansion of this kit will be greatly appreciated, 
i'm sure not only by myself but by many others who are considering 
upgrading yet can't be arsed to write such a freakin long post!!

please share your thoughts!!
cheers everyone
l8rz pete


p.s. bear with me here guys, i cant spell 2 save my life.