Depends on your budget and what sort of music you want to be playing really.
If it's circa £150 then the Harley Benton basses are well regarded as are used Squiers, Vintage etc. When you move into the £300-£400 price bracket then you're looking at Sire V3 (or a used V7), some of the better Squiers (CV, VM etc), Ibanez, Cort, Yamaha BB, Musicman Sub Ray, Spector Performer etc. Unfortunately you're limited regarding trying basses out at the moment so it all depends on what players or recorded bass sounds you like and what you want to sound like.
If you need lower notes then by all means start on a 5 string, keep in mind budget 5 string basses aren't all that great a lot of the time as the B string can sound a bit wet, Cort built basses (Cort, Ibanez among others) and Sires have good low B strings, Yamaha also.