"upgrade" = bad idea
Thanks guys for the input. Looks like I will buy the Crate for practice/studio applications and later will invest in a more powerful amp for loud jamming and giging.
I may be too late to help VirtualSamana but since this thread is still active maybe I can save another soul...
You may be on a budget but buying a 50W bass amp (regardless of the brand) and upgrading later is a bad idea and here is why...
Everyone is absolutely correct when they say that the 50 watt won't keep up with the drums or even a 25 watt guitar. It may sound great in the store but it will sound like horsesh!t when you jam with other instruments. You will have to crank it up to 10 just to be heard and at that volume you will overdrive the speaker and the sound will be something like a scratchy guitar but in a lower register.
You will get frustrated with the sound and then when you go and upgrade you will get a fraction of what you paid for the 50W as a trade in.
Do yourself a favor and go into a little debt if you have to and get a 75 if not 100W right of the bat. Also, just as important as wattage is speaker size 15" is better than 12".
SWR makes a 15" 100W combo amp that retails for $300. Pick up something like that USED at guitar center and take advantage of there 30 day money back trial period on used gear.
I don't even try stuff in the store any more. If the light goes on when I hit the switch I just buy it, take it to the studio, and put it through its paces. If it doesn't work, return it. So far I've never had to return anything. (This isn't plug for GC - go to any store that has such a return policy).
I have been playing bass for 16 years and found you should never skimp on amplifiers or those acoustic basses. They sound good in the store but not when you get them home!
The 15" combo is small enough to take home and if you want to practice set the volume low or use head phones.
I personally own a Peavy
TKO 75 with a 12" cone. When I practice I would actually rather drag my 350W head and 18" cabinet with me.
When it comes to bass amps don't skimp!
-Roaf