The most popular brands chosen reminds me, oh yeah this is an American based site. 
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I hope you have a pretty clear idea of what your requirements are, how loud you need to be.
Another consideration is weight; Ampeg SVT's are great amplifiers, and the 8 10's are great cabinets, but a lot of people can't or won't carry them around.
And then there's the $. Not everyone has AER or Walter Woods money; I don't.
Consider buying used; ask the bassists you know or meet for advice.
I repeat myself here, but old Peavey bass amps are almost indestructible and a lot of amp for the money.
I have played through (either owned or back-lined) Ampeg, GK, SWR, Mesa, TecAmp, Fender, Hartke, and Peavey...they all sound amazing in their own right. I landed on a Mesa BB750 and traditional Mesa 610, and its works great for what I'm playing/style. It all comes down to you...what you like, and what your budget is...
if you cant tell from reading on here...buy used so if it doesn't work out, you can recoup/swap for something else that may be more your "speed"...plus you can get something a little more "high end" for your budget. Take your bass, and if you have/use effects, to a store, or all the stores near you and try everything they have...take some notes, and see what works...FOR YOU.
A separate head and cab is the most versatile set up.
Here in the states there are GTG ( GetToGethers).
I've been to one and there was 20 bass players with different gear
and the purpose was to try them all and see gear you normally
don't see.
Try a bunch and find one you like. I personally like fender and swr stuff, you can find affordable stuff and top end stuff from both.