Need advice on integration

[sounds]

Hi,

I'm renting whmcs for the time being while i figure out my design setup.
I started off with wordpress because the wordpress bridge is free to use,
It does an ok job of integrating whmcs, i don't have a login to wordpress for security.

But i can't really get any theam for wordpress the way i want them in the client area of whmcs.
Those themes are not cheap either, at least 40 bucks a pop, and i can't be doing that.

Another option i have is to use joomla which i feel is a better option, but the jwhmcs is 150$.

They say it's not a good idea to integrate wp login with whmc, is the same true for joomla?
Because i see a lot of sites using joomla with whmcs and full login integration etc.

Would it be difficult to do the whmcs integration with joomla by myself?

I know i could get a custom theme for whmcs but i like the idea of adding extensions/plugins etc to build up a design.
Have a nice deal on whmcs so it's not expensive but i'd like to get my design sorted and start on products then buy whmcs.

[mylove4life]

I would not integrate any of that with WHMCS; there are just too many potential security holes