New piano/keyboard suggestions

I've got a (very) basic Casio 61 key keyboard that is about 15 years old now. I'm still very much on the learning slopes of piano/keyboard, but I'm looking to upgrade to a more suitable instrument.

Any suggestions as to what would be a good investment at this stage? I'm not looking to break the bank, but don't mind spending in the region of a few hundred pounds for something that would help my learning accelerate.

Unfortunately I can't offer any suggestions on specific models or brands, but I'll just throw this out there:

You'll never be satisfied with what you have until there is nothing better you can get.

So, keeping that in mind, my only recommendation is to stick to used equipment and trade up as you are able to.

My two pence.

Depends if you want to learn to play piano or keyboard (synth) in general.
For piano get an acoustic one, if for some reason you don't want to or can't, get a digital piano with full 88 keys, something like graded hammer action or whatever they're called, depends on manufacturer.
The really cheapest ones are probably Casio (well if you don't count chinese brands like Hemingway).
Google is your friend.

Thanks endre. Just had a quick peek at acoustic options. They look pricey and take up more room. Presumably they have to be tuned reguarly too. I'm kind of reluctant to shell out too much at this stage so maybe the digital route is the way to go.

Of course you buy what makes sense to you.

Just remember a digital piano will never feel or sound like a half decent acoustic. I know. Went the DP route myself, can't say I regret it, couldn't practice without headphones, but I can't wait to move to some better, bigger place, so I can upgrade to some used upright (looking at my options there are 10-20 year old uprights here, not high profile brands but not bad ones, for about 1000-2000 euros, maintained / repaired at stores , I got for my Roland rp101 for about 1000).
An upright has pretty much same footprint as a console-type digital piano.

way late of a response and i dont know how much these are in pounds but for a good electronic keyboard your really wanna spend around 1500 to 2500 us dollars which amounts to finding a good deal on a new or used yamaha motif xs6 ( i own this one and its got amazing sounds including beautiful piano sounds) for a bit more but its a great comparable keyboard roland fantom in phenomenol... korg also has a comparable one in this price range... these are really top of the line but heres the trick... buy the smallest one because it has all the sounds of the big ones... difference is that the keys wont be weighted. what you do is buy a really nice 88 key controller and then hook it up as a slave with midi so basically all the sounds come from your nice keyboard but you play on the nice keys.. this also reduces wear and tear on your 2000 dollar keyboard..trust me these keyboards are well worth the price and they double as sequencers and mixing boards etc.... 100's of sounds