Oh, and I just realized that you're planning on getting a JSX - honestly man, I'd advise getting a 5150 instead unless you think you're gonna be playing live predominately (and requiring a clean channel). The JSX is the better amp for a live environment to be sure, but recorded, I've tried it many times through many cabs, and the best clip I could get is on my soundclick player on my myspace in my sig (Mesa Stiletto Cab Test), and it's honestly not a sound I like - too smooth and kinda thin sounding (and I tweaked the holy hell out of it before I settled on that recording, cuz I had the cab in another room and the head in with me, so I was tweaking by the sound through my speakers). All the clips on here I've heard of the JSX (DSS3, Bloodjinn) have that same kinda thin/smooth sound, and it's just not a sound I like, so my JSX is now up on my local craigslist for sale.
I plan on replacing it with a Line 6 HD147 (for my live playing) and an Orange Tiny Terror (and eventually a Krank Rev Jr.) for recording, cuz it's not like I'll need a high-powered tube head for the studio!