Syrians are the easiest to handle and are invariably quite friendly, whereas some of the dwarves can be too quick to handle reliably. Dwarves are also very diabetes prone, so you have to be very careful with sugar content (even to the point of avoiding veg like carrots)
Some people say females are more active and have more 'get up and go' than males, though I've only ever had a female, so I can't compare!
Cages wise - the Zooplus Alaska / Barney / Alexander cages are excellent, and fab value for money compared to some of the crap sold in shops like Pets at Home (they even do free delivery, which is useful if you're housebound!). If you want something that's got plastic shelves and a couple of tubes, then the Savic Hamster Heaven is very good. The cages I've mentioned range from £32.99 to £69.99, so unlikely to break the bank compared to other suitable options!
Your hamster will also need a big wheel - if they have to arch their back at all to run, then they will develop painful spinal problems. Mine has a 29cm Karlie Wonderland wheel, though there are other options available of a suitable size e.g. Trixie 28cm wheel - some of them are labelled as being for other, larger rodents like rats, but are absolutely fine for a Syrian!
As I'm sure you'll know, they also need some things to chew on (see this recent thread www.mumsnet.com/Talk/super_furry_animals/2806278-Normal-for-a-hamster)
Wilkinsons has a surprisingly good and inexpensive selection of hamster toys, and you can also find good options on websites like Viovet and Zooplus.
Harry Hamster food tends to get good reviews, and it's only £2 for a bag in Pets at Home.
Treats wise - they tend to like a variety of things, from small quantities of fruit and veg, a little cooked pasta, unsalted nuts, through to hamster specific treats like milk drops.