Personally, I think you need to get some of these basses in your hands. I've always maintained that the feel of a bass is the single most important thing; if it doesn't feel comfortable and easy to play you're never going to get the most out of it or realise your full potential as a player.
Anyway, my personal recommendation would be to go for either a Yamaha RBX270 or an Ibanez SR300. I would personally go for a bigger combo, like a 100w 1x15", a. because you'll get a bit more depth and guts out of it, b. because if you want to play with a drummer or something you'll be able to keep up, and c. because there's a lot of satisfaction to be had from cranking it up once in a while! As others have mentioned, any of the well known brands will be fine; Fender, Ashdown, Peavey, Marshall, Laney, Ampeg, etc, etc. There are some older Trace Elliot combos to be had for not much money for a great amp.
Good luck, hope you find a bass you love!