Right, aquaurium buying can be a bit of a minefield for some.
Just to let you know, I bought my first tank, a Fluval Roma 90 litre tank with a cabinet stand from P@H for £200, that came with standard lighting hood with 2x 28W T8 lights, U2 internal filter, 100w heater and that was it basically.
(there was a bottle of Nutrafin Aquastart included but did not use it as these are rubbish TBH and a tub of fish flake, still not opened actually! lol)
Aquariums are of personal tastes, but one piece of advice is common, get as big as you can afford and have room for.
(I actually have a Juwel Trigon 350 in the garage, why is it in the garage, well, its too big you see, it can't fit throughout the door!
)
That did not include any decor, gravel, essential pieces of kit like, nets, dechlorinator, gravel cleaner, buckets, test kit and most importantly no stocking or live plants.
So my budget of £250 was basically blown out of the water! lol, in fact spent nearer to £450 for everything.
But a good learning curve for me and I don't mind the fact I spent way over the budget as I am lucky can afford this overspend but GF was not impressed! lol
So when you are budgeting, you are best to make a list of what you want and in order of priority, stuff like nets, gravel cleaners and glass cleaners and that sort of thing can wait, but you do need a decent test kit, and dechlorinator and buckets.
Chain store LFS can offer decent whole set up deals while smaller LFS tend to be a bit more expensive I've found.
As suggested already, you can get great deals online through sites like eBay for second hand tanks set ups with everything. This is a good way to get a good deal.
There is a classified section on this forum, so you know pretty much you'll get a decent tank and at a fair price, some are great deals. Worth checking out.
http/www.fishforums.net/index.php?/forum/216-equipment/
Although when I first set out to buy my first tank I did not want second hand, I wanted brand new as know this would be safe to use and had warranties and peace of mind etc etc. However, I will get a second hand tank now that I have a better idea of what to look out for.
It how you feel what's best for you for your first tank set up. £85 for a tank is fairly reasonable, does that include a stand, filter and heater? If so then sounds ok to me, if you are happy with the quality and build of that. If its just for the tank only, not so good a deal but not exactly a rip off either.